Langir: Your Dependable Momentary Switch Supplier from China

As the leading manufacturer based in China, Langir consistently provides the best quality of momentary switches like no other.

The Langir momentary switch is the most distinctive among the vast Langir push button switch family. We pride ourselves on its utmost reliability, optimum performance, and almost infinite service life. Whether it is the normally open (NO) or push-to-make momentary switch or the normally close (NC) or push-to-break switches. You will have peace of mind that the Langir momentary switch will work every single time.

The Langir momentary switches offer many types, colors, shapes, bushing diameters, and other specifications. They also have different terminal and mounting types. With quick-connect features; you can mount your momentary switch in no time without problems.

Langir offers dust-tight and waterproof momentary switches so that you can use them in outdoor applications worry-free. Aside from that, we offer IK10 momentary switches that can endure tough environments and will still produce their prime performance regardless. With Langir, you are guaranteed high-quality momentary switches, the best in the world.

Here in Langir, we submit our momentary switches to international certifications and quality inspections to ensure that we meet our customers’ expectations and requirements. You are always assured that our momentary switches are top-notch in quality and performance. As a push button switch manufacturer you can trust, we guarantee your satisfaction by choosing us for your momentary switch needs.

Ordering from Langir is also simple and fast. Our momentary switches are stored properly always ready to be dispatched and delivered to our customers anytime. In just a few days after your order confirmation, your momentary switches will arrive at your location in perfect condition and always ready for installation.

Our trained sales team is always happy to accept your calls and ready to offer you with only the best solutions you need. Simply call us for any of your inquiries and we’ll handle the rest.

Momentary Switch — FAQ Guide

This momentary switch FAQ guide will help you make the right decision in choosing the best suitable momentary switch for application.

You will learn its vast range of varieties, types, configurations, and the many applications of the momentary switches.

Aside from that, you will learn about how they can be installed in several applications which you can refer to for your future momentary switch projects.

You will also learn the many advantages of using a high quality momentary switch and how you can find them when you are doing your shopping.

Furthermore, you will be guided on how you can take proper care of your momentary switches and help prolong their service and shelf life as well as maintain their top performance.

So before you hit the check out button, read this complete guide of everything about the momentary switches so you will be a smarter shopper when choosing the best momentary switch for your application.

1. What is the momentary switch and how does it work?

Different types of momentary switches

瞬时开关被归类为一种具有瞬时开关动作的开关，用于驱动开关单元以将其“打开”或“关闭”。.

它也被称为非自锁开关，因为与自锁开关（瞬时开关的对立类型）相比，它表现出不同的开关动作。.

其他相关术语包括瞬时按钮、瞬时按钮组、瞬时按压开关、瞬时按压、瞬时按压开关、按钮式瞬时开关或瞬时按钮。.

“瞬时”一词指的是开关的临时状态，因为其弹簧加载的执行器在释放施加的力后不会保持压缩状态。.

相反，瞬时开关的执行器会弹回其正常状态或未驱动形式。.

瞬时开关具有多种类型和配置，以适应其众多应用，使其成为一种多功能的开关类型。.

瞬时开关的常见应用包括门铃、蜂鸣器、对讲机、电梯呼叫按钮、门或大门开启器、柜门开启器、家用电器等。.

趣闻：瞬时开关曾被称为“懒人开关”。”

瞬时开关最早的应用之一是Zenith无线电公司在1950年开发的有线电视遥控器，名为“懒骨头”。.

这是当时为电视机发明的第一个遥控器，人们无需起身通过电视机上的控制装置来切换电视节目。.

这变得非常流行，因为它带来了便利，并且当您坐在沙发上放松时观看电视节目更加愉快。.

其中一种类型是陶瓷材质，其按钮作为电视的开关；另一种类型是封闭的漏斗形遥控器，两侧各有一个瞬时开关，可以用拇指操作来切换电视频道。.

这款遥控器很快就被新的发明所取代，可能是因为人们经常被遥控器电线绊倒的抱怨。.

后续的遥控器都采用了类似的瞬时开关动作，并逐渐演变为我们现在使用的现代遥控器。.

懒骨头有线遥控器。

2. 我们在哪里使用瞬时开关？

除了家庭应用之外，瞬时开关还有许多其他应用。.

瞬时开关存在于我们的日常生活中。.

例如，当您使用电梯时，电梯控制面板上的一些按钮就是瞬时开关，如开门和关门按钮、呼叫按钮，甚至拨号盘按钮。.

另一个例子是计算机键盘上的按键。.

它们都是瞬时开关，属于按下接通类型。.

除了这些例子，还有鼠标按钮、激光笔上的按钮、防盗警报器、自动售货机等。.

以下列举了一些使用瞬时开关的行业：

• Agriculture
• Airlines
• Automotive
• Construction
• 家用电器
• 工厂机械
• 食品和餐饮
• 食品包装
• 服装工厂
• 健康和医疗
• 军事设备
• 海洋船舶
• 发电厂
• 交通运输
• 水处理设施
• 以及更多

瞬时开关的不同应用。

3. 瞬时开关的结构由什么组成？

瞬时开关有多种形式，可以通过按压、触摸、摇动、滑动、旋转、拉动、钥匙转动、投掷、加热、磁化、弹拨、踢动或任何其他物理力或与执行器的交互来驱动。.

这就是为什么瞬时开关的结构取决于其形式。.

在这种情况下，我们将讨论按钮或拨动类型的部件，这是市场上最常见的瞬时开关。.

瞬时开关主要有两个部分：头部（执行器或按钮所在处）和其主体（有时称为外壳、罩壳或 enclosure）。.

以下列举了瞬时开关的重要部件，了解这些有助于您为应用类型找到最合适的开关。.

• Actuator

这是瞬时开关的弹簧加载机械部件，我们通常称之为开关按钮，通过按压或推动的物理力来驱动。.

这部分是瞬时开关面向用户的部分，也是安装后唯一可见的部分。.

执行器可以是平头、凸起、倒角、凹面、穹顶或凹陷面。.

您还可以找到带有激光蚀刻电源符号的执行器，非常适合需要电源开关的应用。 电源开关。.

瞬时开关有不同颜色可供选择，如自然色、铬色、白色、黑色、金色、红色、蓝色、红色、橙色、黄色等。.

通常，执行器与瞬时开关单元的其他部分颜色相同，但也有选项可以选择不同颜色的外壳。.

• Body

这部分包围并保护瞬时开关的组件，并主要支撑其结构以确保最佳工作性能。.

它可以是圆形瞬时开关或方形瞬时开关。.

• 也称为自锁按钮开关的端子。

这些通常也称为端子，是突出在瞬时开关底部的小金属条。.

例如，2针瞬时开关、4针瞬时开关、5针瞬时开关和6针瞬时开关。.

这些引脚有不同的类型，如焊接片和螺丝型是最常见的，但也有铲形端子、穿通式和其他可用类型。.

根据瞬时开关的电气配置，引脚可以是两个或更多，其他配置可以有最多6个甚至更多。.

其他类型的瞬时开关不需要这些引脚，因为它们被设计为密封式，电线已集成到开关单元中。.

• Illumination

其他类型的瞬时开关被称为 带灯瞬时开关， 或者有时我们称它们为照明瞬时开关或 带LED的瞬时开关。.

一般来说，这些类型的瞬时开关在其机构内部配备了LED芯片，当您按下执行器时能够发光，但这取决于电线如何连接到其引脚。.

您可以找到不同的照明设计，如全照明、环形照明、点状照明、电源符号照明、环形加电源符号照明，以及带有指示其功能或用途的标识的背光标签。.

• O型圈

这个通常为黑色的橡胶圈穿过瞬时开关插入，并放置在执行器下方，以帮助密封执行器与其安装表面之间的间隙。.

• 这也称为螺母或安装螺母，是一种六角形金属件，用于将自锁按钮开关固定在面板或表面上。

这是一个通常呈六边形的金属环。.

它用于从面板背面固定瞬时开关，但也有其他开关形式是从面板正面固定安装法兰的。.

• Grooves

这些沿着瞬时开关主体或头部雕刻的线条作为其螺纹，用于牢固固定安装法兰。.

• 螺旋弹簧

The coil spring is typically fabricated from metal and functions as the enabling mechanism for the momentary switch's actuator movement.

Depressing the actuator compresses the coil spring, thereby storing mechanical energy.

Upon releasing the actuator, the stored mechanical energy is released, returning the actuator to its normal or unactuated state.

• 触点

These are the electrical conductors installed within the momentary switch.

There are two types of contacts: movable contacts and stationary contacts.

Actuating the momentary switch causes the movable contacts to engage with the stationary contacts, thereby establishing an electrical circuit and activating the switch.

However, this depends on the normal contact configuration of the momentary switch, as another type features contacts that are initially closed and separate when the actuator is pressed, thereby interrupting the electrical flow.

• Module unit

A module unit is a self-contained assembly designed for specific types of momentary switches.

This also implies that the momentary switch lacks moving parts, which contributes to an extended service life.

• Touch sensor

The touch sensor is a technology incorporated in momentary switches where the actuator responds to light touch, thereby activating the switch.

Consequently, minimal physical force is required for actuation due to the switch's touch-sensitive characteristics.

While other components of the momentary switch may not be listed here, these are the most common parts whose functions are essential for maintaining the switch's structural integrity and operational capability.

Parts of the momentary push button switch

4. How does the momentary switch compare to the latching switch?

At this point, you have learned that the momentary switch returns to its original position upon release of actuator pressure.

In contrast, for a latching switch, non-momentary switch, or maintained switch, the actuator remains in the depressed state even after the applied pressure is removed.

Hence, the term “maintained switch” is frequently used interchangeably with latching switch.

A locking mechanism within the latching switch retains the actuator in the depressed position.

The latching switch's actuator will only return to its original or unactuated position when pressed again.

The operational behavior observed upon actuation of latching and momentary switches is referred to as switch actions.

These switch actions are critical for specific applications, as the alternative action may be incompatible.

For example, doorbells utilize momentary switches, allowing visitors to press briefly to sound the chime and alert the household.

If a doorbell employed a latching switch, the chime would ring continuously once pressed, only ceasing upon a second press—an action that cannot be imposed on visitors.

Therefore, doorbells exclusively use momentary switches.

The same principle applies conversely to the latching switch.

For instance, light switches use latching switches because illumination must remain on after the initial press and turn off only upon a subsequent press.

A momentary switch would only illuminate lights while being pressed, extinguishing them upon release, which defeats the purpose of a light switch.

As evident, identifying the switch action compatible with your application is crucial to avoid incorrect selection, additional costs, and wasted time.

However, other switches, such as the 2-step momentary switch, are classified as latching momentary switches for incorporating both actions.

Momentary switches on vintage doorbells

5. What kinds of materials constitute the momentary switch?

Momentary switches are manufactured from various materials, including:

• Aluminum (Natural, anodized)
• Brass (Natural, nickel plated, or gold plated)
• Chrome
• Copper (Nickel plated or gold plated)
• Nitrile
• 聚碳酸酯
• Silicone
• Silver alloy
• 不锈钢
• Other materials as needed

One example is the metal momentary switch, primarily constructed from metallic materials.

Despite material diversity, stainless steel often stands out due to its anti-corrosive properties and durability.

Stainless steel is also widely used in products such as kitchen appliances, utensils, cookware, tools, and even in residential and commercial construction.

It encompasses a broad range of types, often categorized by SAE (Society of Automotive Engineers) designations to distinguish their unique compositions.

Regarding momentary switches, the two most commonly used grades are:

• SAE 304
  • This is the primary choice for manufacturing metal momentary switches, as it already exhibits heat and rust resistance.
  • This is also referred to as 18/8 stainless steel.
• SAE 316L
  • Second to SAE 304, this stainless steel grade offers superior heat and rust resistance, enabling the momentary switch to be used in saline environments.

Momentary switches made of different materials

6. What does NO or NC mean in momentary switches?

«NO» and «NC» are abbreviations for the two commonly known normal contact positions.

Or the original state of the momentary switch, or any switch, when not actuated.

«NO,» in its expanded form, is read as “normally open”; thus, when describing a momentary switch, it is labeled a "normally open momentary switch.".

The contacts in a normally open momentary switch are in an open position, meaning they are not touching, thus preventing electrical flow.

However, pressing the actuator of a normally open momentary switch causes the contacts to connect, enabling electrical flow and actuating the switch.

This is why the normally open momentary switch is also termed a push-to-make switch.

Conversely, “NC” is the abbreviation for “normally closed”; hence, when referring to a momentary switch, it is labeled a “normally closed momentary switch” or NC momentary switch.

The normally closed momentary switch has its contacts closed, meaning they are connected, allowing electrical flow and actuating the switch.

Pressing its actuator interrupts the electrical flow, deactivating the switch and halting the operation of the connected device.

This is why the normally closed momentary switch is also known as a push-to-break switch.

NC, NO, NO+NC momentary switch symbols

7. Is there a specific mounting method for the momentary switch?

Momentary switches have specific mounting methods, and often one method cannot be substituted for another.

This information is typically provided in the momentary switch's datasheet or product listing details.

Generally, there are three common mounting types for momentary switches:

1. Panel mount momentary switch

• The panel mount momentary switch is generally installed on panel material and has two subtypes.
• It has two subtypes: the front panel mount momentary switch, which features a thicker actuator due to grooves along its sides for flange fastening.
• And the rear panel mount momentary switch, which is mounted from the back of the panel.

2. Surface mount momentary switch

• The surface mount momentary switch is typically smaller in size, such as the 10mm momentary switch, low-profile momentary switch, small momentary button, micro momentary switch, micro push-button switch, or mini momentary switch.
• These types of switches are usually mounted on printed circuit boards (PCBs).

3. 齐平安装瞬时开关

• 齐平安装瞬时开关因其通常采用平头设计且安装于与表面齐平的安装孔中，能提供比其他类型更优的表面间隙。.
• 在此类安装方式中，可使用带盖的瞬时开关。.

控制面板上的瞬时开关

8. 瞬时开关的安装尺寸是多少？

有时为瞬时开关直径所钻的孔可能过小或过大。.

除了导致瞬时开关无法正确安装外，还可能浪费优质面板材料，并使安装过程耗时超出常规。.

因此部分制造商会提供面板开孔图，即瞬时开关直径尺寸的图示，可作为开孔的描摹指南。.

有时还会提供面板后方间隙尺寸，以容纳瞬时开关及连线的长度。.

面板厚度同样关键：过薄的面板可能无法稳固支撑瞬时开关以承受按压时的压力；而过厚的面板可能导致安装松动，因为安装法兰无法紧固。.

至少应使用厚度约10mm的面板。.

面板开孔图示例

9. 电路中用于定义瞬时开关的专业术语有哪些？

与其他开关类似，瞬时开关也有四种电气配置，通过以下术语定义：SPST、SPDT、DPST和DPDT。.

这些缩写表示瞬时开关的极数和投掷数。.

例如缩写术语«SPST»代表«单极单掷»，这是一种开关的电气配置。.

“极”指单个瞬时开关可控制的电路数量，“掷”指开关的位置或输出端子数量。.

瞬时开关的四种主要电气配置为：

• Single Pole Single Throw (SPST)
  • SPST瞬时开关也称为基本启闭开关，有时称作双向开关或单极瞬时开关。.
  • 它具有一个输入端子，含一个“开”位置和一个“关”位置。.
  • 另一种变体是瞬时启闭开关。.
• Single Pole Double Throw (SPDT)
  • SPDT瞬时开关亦称作A/B开关、先断后通开关或转换开关。.
  • 它具有一个输入端子（一个“开”位置）和两个输出端子，可控制两个电路。.
• Double Pole Single Throw (DPST)
  • DPST瞬时开关也称为双电路开关、双联瞬时开关、双极瞬时开关或双重瞬时开关。.
  • 它具有两个输入端子和两个«开»位置，但仅有一个输出端子。.
• Double Pole Double Throw (DPDT)
  • DPDT瞬时开关有时被称为两个SPST开关的组合。.
  • 它具有独立的输入和输出端子，可配置为SPST开关。.

电路中的不同类型的瞬时开关

10. 是否存在防破坏型瞬时开关？

是的，这类开关称为 anti vandal momentary switch.

这些是重型瞬时开关，可承受滥用和高频使用。.

它们通常具有IK密封或冲击等级认证，表明开关抵抗不同等级冲击的强度。.

制造商将防破坏瞬时开关进行多项冲击测试，以验证其外壳承受高达20焦耳（相当于5公斤重物从40毫米高度跌落）冲击的韧性。.

IK等级越高，表示瞬时开关提供的防护能力越强。.

最高IK等级为IK10。.

因此防破坏瞬时开关适用于公共场所或任何暴露于频繁使用和恶劣条件的应用场景。.

IK10等级对照表

11. 瞬时开关是否适用于户外环境？

是的，但需选择适用于户外的瞬时开关型号。.

户外环境会使瞬时开关暴露于外部因素和变化的天气条件中。.

这意味着固体或水分很可能进入瞬时开关外壳，对其内部组件造成损坏。.

需选用专为防水防尘设计并通过测试的防水瞬时开关。.

防水瞬时开关带有IP等级认证（侵入防护认证）。.

该认证表明瞬时开关可防护固体和液体侵入的等级。.

IP认证后跟随两个数字。.

第一位数字表示对固体颗粒的防护等级，第二位数字表示对水等液体的防护等级。.

防水瞬时开关通常具有IP68和IP69K等级——这是最高防护等级，意味着完全防尘并可承受任何形式的水侵入及长期水下浸泡。.

这类开关有时被称为船用瞬时开关。.

而IP65等级及最高至IP67的瞬时开关为防尘型，并被视为防水瞬时开关，可承受喷水和临时性浸水。.

防水瞬时开关

12. 是否存在触摸触发型瞬时开关？

是的，存在触摸触发型的瞬时开关。.

此类开关触发所需力度较小，可节省体力。.

它们还有密封型瞬时开关，避免了机械部件老化引发的问题，从而增强可靠性并延长使用寿命。.

• 压电瞬时开关

压电瞬时开关也可称为“压电触摸开关”，因其采用压电原理工作。.

压电原理是将机械能转换为完成电路所需的电能，这称为压电效应。.

压电瞬时开关内置压电元件，负责产生电荷以激活FET（场效应晶体管，一种半导体）。.

当触摸压电瞬时开关时，FET将激活内部模块并使电流导通。.

当触发停止时，FET中的能量减少并恢复初始状态，直至压电瞬时开关的执行器再次被触发。.

• 电容式按钮开关

电容式瞬时开关被视为“真触摸”开关，因其触控灵敏度极高，仅水流即可触发。.

它采用称为电容场的触摸传感技术。.

电容场在其执行器上形成充放电循环的场域。.

任何带电荷的物体（即使电荷量极小）均可触发电容式瞬时开关。.

When a human finger touches the actuator, the capacitance field is interrupted and this initiates the actuation of the capacitive momentary switch.

Our body has a small amount of flowing current which is why the capacitive momentary switch reacts to our touch.

Even when you are using an object to touch the actuator, as long as this object can carry electric current from your body or carry a small current of its own, it can actuate the capacitive momentary switch.

Aside from having no mechanical parts, the piezo momentary switch and the capacitive momentary switch both have integrated wires which make them perfect for wet environments.

There is no need to solder the wires or placing adhesive on them hence making the installation faster and easier.

One example of it is the momentary dimmer switch.

Capacitive switches

13. Are there alternatives to the momentary switch?

The momentary switch is just one of the huge number of switch types that are used in many applications.

There are also other types of switch alternatives to the momentary switch and these are:

• Flip switch
• Rocker switch
• Rotary switch
• Knife switch
• Mercury switch
• Footswitch
• And so on…

It is imperative to learn about these switches such as their advantages and disadvantages before you decide on choosing them for your application.

14. What does NC-MOM in momentary switches mean?

The abbreviated term is read as a normally closed momentary switch which means that when you press its actuator and release it, the switch turns «on».

In a schematic diagram, it can also be labeled as ON-MOM where the term ON means «on» status instead of an abbreviated term, therefore it is read as «on momentary».

NC-MOM can also have different electrical configurations such as SPST, SPDT, and so on.

Knowing how to understand these terms will help you know what type of momentary switch you will need especially when you are basing it on a schematic diagram.

15. How to work with momentary switches safely and properly?

If your momentary switch is high quality, it has passed strict safety requirements which relieve concerns about issues that can cause accidents while working on it.

But sometimes practicing safety measures is better and would promote worry-free conditions for you.

Here are some safety steps before working on your momentary switch:

• Ensure that you are in a well lighted area
• Organize tools and materials to find them easily
• Remove unrelated items on your work table
• Use a spill-proof mug to avoid spilling liquid on tools and materials
• If you will be working with live wires, turn off the power supply first
• Avoid touching components with running live electricity
• Check your momentary switch for any obvious damages or rust formations that may require repair or replacement since it may not be a good switch to work on anymore.
• Make use of the manufacturer-provided momentary switch manual such as wiring instructions, catalog, datasheet, etc.
• Make sure that there’s no flammable gas surrounding your work area since this could react from an electrical spark which can lead to explosion and fire.

Your manufacturer may also provide you with a list of safety measures specific to their momentary switches either via the product packaging or on their website.

Example of soldering work table

16. How to install the momentary switch to replace an old doorbell button?

If your doorbell’s button is already faded in color or broken, you can replace it with a momentary switch.

Ensure to choose a waterproof type since its doorbells are placed outside which exposes it to rain.

Prepare the materials below:

• Momentary switch (two units if you have a backdoor doorbell)
• Screwdriver

While the following materials may be needed when necessary:

• 压接工具
• 按钮开关盒或按钮开关外壳（带有与按钮开关直径相同的孔）

You can also purchase a switch box if your old doorbell button is not round in shape.

By doing this you separate the button of the doorbell from its doorbell unit and may need to mount the switch box separately on the wall beside the doorbell unit.

The switch box usually comes with some drilled holes and for this procedure, you can choose the one with a single hole with the same diameter as your momentary switch.

The steps below should guide you in the replacement process.

Step 1: Remove the old doorbell

Take out the old doorbell button as well as the wires connected to it.

Do the same if you have a second doorbell for the backdoor.

Step 2: Connect the wires

Take one wire and connect it to a pin of the momentary switch.

Then connect the other end of the same wire to the transformer.

Then a separate wire connects the second pin of the momentary switch to the first terminal of the signaling device.

Then take another wire to connect to the second terminal of the signaling device to the transformer.

Step 3: Wire the second doorbell (skip this step if it is not applicable)

If you have a second doorbell for your backdoor, you can connect a separate wire from the third terminal of the signaling device to the pin of the momentary switch.

Then another wire from the second pin of the momentary switch to the transformer, connect it to the same terminal where the first momentary switch is also connected.

Step 4: Test your doorbells

Mount the momentary switches and the doorbell back to the wall.

Lastly, test your newly installed doorbell buttons.

Doorbell wiring diagram with momentary switches

17. How do you replace your vehicle horn button with the momentary switch?

You can use the momentary switch if you would like to replace a broken horn button on your vehicle.

黑色瞬动开关完美契合您的汽车内饰。.

实际上，在某些地区，使用故障喇叭驾驶属于违法行为，因此必须保持车辆喇叭正常工作，这既是为了您自身的安全，也是为了行人的安全。.

在开始之前，请确保此操作不会使您的车辆保修失效。.

对于新车而言，喇叭故障通常包含在保修范围内，并由经销商或汽车制造商提供服务。.

若非上述情况，您便可继续进行。.

此操作所需物品如下：

• 1块12V电池
• 1个12V瞬动开关
• Wires

操作步骤如下：

步骤1：连接瞬动开关线路

从喇叭装置引出导线，将其连接至瞬动开关的一个引脚。.

然后使用另一根导线将瞬动开关的另一个引脚连接至12V电池的正极。.

步骤2：连接接地线

将一根独立导线连接至12V电池的负极作为接地。.

再从喇叭装置的另一个端子引出一根导线，连接至车身进行接地。.

您也可以选用带指示灯的瞬动开关类型，因其在夜间能发光而更易于定位。.

汽车喇叭接线指南

18. 瞬动开关如何控制警笛工作？

警笛是瞬动开关的另一应用场景。.

通常，警笛装置配有两个瞬动开关。.

其中一个按钮用于切换警笛音调模式，如急鸣、长鸣、双音调等。.

而另一个瞬动开关的功能是在按压期间持续延长警笛音调。.

警笛装置示例

19. 瞬动开关如何解决骑行者的难题？

骑行者在夜间骑行时面临一大困境。.

当对向车辆的前照灯（尤其是使用几乎能模糊视线的高光束时）造成眩光时，将难以看清道路。.

为解决此问题，您可以使用瞬动开关作为控制装置来连接自行车前灯。.

将自行车前灯安装在车把上，瞬动开关则安装在左右握把中最方便操作的位置。.

您可通过按压瞬动开关开启自行车前灯，以警示车辆您的到来，促使对方关闭远光灯。.

尽管此法无法保证始终有效，但在黑暗环境中骑行时，它仍能为您增添一层安全保障：您能更清楚地观察路况，其他车辆也更容易注意到您。.

带前灯的自行车

20. 瞬动开关在计算机中如何工作？

计算机的电源按钮和复位按钮均属于瞬动启动开关类型（或称PC瞬动开关）。.

两者功能相似，皆用于启动系统单元运行。.

虽然现代计算机大多不再配备复位按钮，但部分计算机组装商仍会应客户需求保留该设计。.

复位按钮可重启计算机，此功能也可通过电源按钮实现。.

该按钮通常在计算机死机且重启是恢复运行的唯一方式时使用。.

然而，按压电源按钮也能达到相同效果。.

电源按钮可重启大多数计算机启动序列（而复位按钮仅能重启部分启动序列，并非全部）。.

因此计算机制造商认为复位按钮并不实用。.

尽管此方法可简易解决计算机死机问题，但仅应作为最终手段使用。.

请先尝试按CTRL-ALT-DEL打开任务管理器，结束未响应的进程。.

若条件允许，请关闭所有正在运行的应用程序，然后正常重启计算机。.

旧式计算机系统单元的电源按钮

21. 什么是带瞬动开关的双手控制装置？

这是一种两端各设有一个瞬动开关的设备，用作机器的控制装置。.

两个开关彼此远离布置，使用户或操作员能按作业要求同时触发它们。.

该装置需要操作员双手持握操作，故得名“双手控制”。.

22. 瞬动开关在输送机中有何用途？

瞬动开关可作为控制开关，启动输送机的控制电路以接通或切断信号电流。.

此状态会向输送机的PLC（可编程逻辑控制器）发送信号，从而停止机器电机运行。.

据称，此操作方式优于VFD方法（变频驱动方法）。.

作为启动开关的瞬动开关也能停止输送机、启动装载或卸载流程。.

它还支持锁定/挂牌（LOTO）程序，因为瞬动开关能锁定输送机设备的电源供应。.

输送机示例

23. 急停按钮是瞬动开关吗？

是的，您说得对。.

急停按钮属于瞬动开关的一种，即“按下断开”型。.

当按下按钮时，它会立即停止其所连接的任何操作。.

此类按钮通常采用坚固的塑料材质制成，并选用鲜红色，因为人们能轻易识别红色代表紧急用途。.

瞬动开关还有其他类似应用，如紧急切断开关、紧急按钮、医疗警报器、SOS按钮、安全警报器等。.

它们均用于提升安全措施与规程，并必须在紧急情况发生时始终保持可靠。.

急停按钮

24. 瞬动开关能否永久使用？若不能，原因何在？

并非所有瞬动开关都能永久使用，因为其性能和使用寿命取决于以下若干因素：

• 瞬动开关的质量

制造工艺低劣的瞬动开关可能无法持久使用，尽管其标榜保证或宣传。.

虽然它们可能是低价替代品，但后续可能出现性能问题，最终导致无法使用。.

• How the momentary switch is used

Abusing the momentary switch can cause irreparable damage, such as striking it with blunt force or using sharp tools to press it.

Another instance is when it is used beyond its capacity or limitations.

For example, supplying a high electric current to a momentary switch with a lower voltage rating can cause the contacts to burn and ultimately damage it.

Check the label of your momentary switch; it may appear as any of the following: 110-volt momentary switch, 110V momentary switch, 120-volt momentary switch, 120V momentary switch, 12V DC momentary switch, 240V momentary switch, 24V momentary switch, 5V momentary switch, momentary 12V switch, momentary switch 12V, 20-amp momentary switch, or 30-amp momentary switch.

• Compatibility with the environment

Using a regular momentary switch in wet conditions can also affect its performance or shorten its service life.

Moisture and water can enter the switch and cause rapid rust formation in its metal components.

For such environmental conditions, you should choose a waterproof momentary switch.

On the other hand, a high-quality momentary switch, when properly used and installed in an appropriate environment, can last up to a million life cycles, which is more than enough to last a lifetime.

25. What are the common issues with momentary switches?

Some momentary switch issues are unavoidable due to the switch's structural design and the functioning of its components, while others are caused by human error or improper handling.

Some common issues with momentary switches and their definitions are:

• Contact bounce

This common issue occurs with mechanical switches, such as the mechanical momentary switch.

These typically have a coil spring that enables actuator movement when pressed, thereby connecting the contacts.

However, the combined energy from their movement and the coil spring's elasticity causes the contacts to bounce apart once or several times briefly before settling into place.

Although this may not pose issues in power circuits, it can result in pulsating electric current, which could be misinterpreted as data in analog and logic circuits.

One early solution to address contact bounce was to use mercury-wetted contacts in the switch.

However, this solution has become unpopular over the years due to the health and safety hazards posed by mercury if released.

Another solution is implementing a time delay, allowing the contacts to stabilize before introducing current to them.

Lastly, taking several contact state samples before using the momentary switch to change the contact state.

• Arcing

This usually occurs when the momentary switch is worn out, defective, or has loose connections.

A transient arc forms between the contacts, causing a crackling sound and overheating of the momentary switch, which can pose a fire hazard.

You can reduce the power supplied to the momentary switch to quench the arcing.

Otherwise, it is better to replace the momentary switch with a new, high-quality one.

• Incorrect size

This problem arises when you purchase a momentary switch with the wrong bushing size for a device or panel with a fixed hole.

If the momentary switch is smaller than the mounting hole, you can try to fix it by adding an additional O-ring, but this only works if the gap is a few millimeters.

If the gap is too large, you may need to use a label plate with the same bushing size as your momentary switch, which also includes a label.

• Melted pins

The pins of a momentary switch can melt easily if excessive heat is applied during soldering.

You should start with a setting of 370°C on your soldering station, as this temperature is generally sufficient to melt the leads and connect the wires.

When soldering, aim for the lead rather than the pins, with a duration of 1 to 3 seconds.

You can also use a fine-tip soldering gun to avoid connecting the pins or melting the plastic material.

• Loose fitting

This can be due to a loosened mounting flange, a damaged hole, or sometimes because the momentary switch's enclosure is made of plastic that has become brittle over time, causing it to detach from its mounting.

When this happens, repairing the mounting hole or relocating the momentary switch may be necessary.

If the momentary switch is damaged, replacing it with a new one is required to resolve the issue.

• Hot switch

This typically occurs when the momentary switch is supplied with a voltage higher than its rated voltage, which can burn internal components and pose a potential fire hazard.

You can either connect a resistor or conductor in the circuit to reduce the voltage or purchase a momentary switch with the correct voltage rating or one capable of handling a high-voltage supply.

Electrical switch arcing illustration

26. What are the advantages of using a high-quality momentary switch for your application?

High-quality momentary switches provide many advantages and offer greater value for your money.

Here are just some of the advantages of momentary switches:

• Provides user command actuation

Since momentary switches only actuate when pressed by a user, they offer greater control to the operator.

For example, a laser pointer with a momentary switch ensures the laser only lights up when needed, such as when pointing at lecture materials in a classroom.

• Easy installation

Momentary switches are easy to install; even the soldering method typically takes only a few minutes to complete.

Other easy installation methods include using switch connectors, male and female switch connectors, or simply choosing types with integrated wires, such as piezo momentary switches and capacitive momentary switches.

• Safety

Most momentary switch designs are toggle or push-button types, which provide user safety by preventing unintentional operations, unlike lever-type switches that can be easily and inadvertently flicked.

• Millions of service life cycles

High-quality momentary switches have a longer service life, ensuring continuous working performance and uninterrupted operation.

• Cost-effective

In addition to being affordable, high-quality momentary switches offer better value due to their superior durability, eliminating the need for frequent replacements.

• 多功能性

There are almost limitless applications for high-quality momentary switches.

With a wide variety of types and configurations, you can find one best suited for your application and the installation environment.

• Aesthetics

Regardless of the type you choose, momentary switches always deliver an attractive appearance due to their compact and modern design.

• 多样化选择

There are many momentary switch options to choose from, including colors, sizes, designs, logos, illumination types, and more.

• 零维护需求

High-quality switches require almost zero maintenance due to their anti-dust properties.

However, minimal sanitation may be necessary for switches in high-usage areas for health and safety reasons.

Modern application of momentary switches on a controller

27. How do you look for a high quality momentary switch online?

Nowadays, most people go online to shop for whatever they need and have their purchases delivered to their doorsteps.

But when it comes to finding a high quality momentary switch, the search can be difficult especially when you are not familiar with the indications that certify a high quality product.

So before you start shopping, read the guide below so you can be sure that you have chosen a high quality momentary switch.

• 良好的客户评价

There are manufacturer’s websites or marketplaces selling momentary switches which include reviews from their customers.

These reviews are very helpful if you want to learn about the quality of the momentary switch from customers who have already tried it.

It is important to spare some time to read them; from their firsthand experience, you can gauge whether the momentary switch is high quality or not.

• Look at the images and watch the videos.

All momentary switch product listings have one or more photos posted on their listing page.

You can also watch its videos if available to learn more about the momentary switch and sometimes the company as well.

Sometimes when the product is new, it doesn’t have any reviews yet, so these images and videos can help in inspecting the quality of the momentary switch.

You can zoom in to get a better visual of its material’s texture, edges, joints, or the momentary switch as a whole.

Sometimes by carefully checking these out, you can determine if it is high quality or not.

• Value over price.

There are momentary switches that are cheap and sometimes they offer a sweet deal that can be hard to resist.

However, oftentimes these cheaply priced momentary switches do not have the kind of quality that you need for your application.

Check what the momentary switch can offer you, such as its quality, features, and other specifications that you require.

Always put value first before price.

Sometimes you find a high quality momentary switch which can cost a bit more, but if it offers the right value to you, then it is a better choice than opting for a lower-priced one with less value.

• Trusted brand.

Always look for a trusted brand, a company that has been manufacturing momentary switches for many years.

You can check the company’s website and learn more about them and their history.

You will also find their certifications, which guarantee the quality and safety of their products.

Having long years of experience in the industry, they have already undergone many audits, certifications, and even recertifications, since some certifications need to be renewed after several years.

These companies have built their authority and credibility, which is why they implement strict quality inspections to guarantee high quality momentary switches.

• Quality markings.

A high quality momentary switch usually has quality markings on its product listing page, packaging, or on its manufacturer’s website.

These markings can be quality seals or certifications that the manufacturer has acquired from independent governing organizations or process standardization companies.

This means that the momentary switch is manufactured to be high quality to meet consumer expectations.

You may not be familiar with these markings, so below are some of them with a short description for each.

• IP65 up to IP69K – These Ingress Protection seals signify that the momentary switch is dust-tight and water-resistant or waterproof.
• IK10 – The highest level of impact protection seal, which means that the momentary switch is robust and vandal-proof.
• CE (Conformité Européenne) – This marking implies that the momentary switch conforms to European standards for safety, health, and eco-friendly process requirements.
• ISO 9001:2015 – This confirms that the manufacturer of the momentary switch is compliant with the QMS (Quality Management System) set by ISO, the International Organization for Standardization, meaning that their provided products or services meet customer requirements and expectations.
• REACH – This indicates that the manufacturer only uses safe materials to make their momentary switches.
• RoHS – This seal confirms that the momentary switch does not contain alarming levels of harmful chemicals, meaning that it is safe to use.
• TÜV – This is a confirmation that the manufacturer of the momentary switch complies with the Technical Inspection Association, which assesses facilities, processes, and products to promote safety.
• UL – This seal certifies that the manufacturer meets the terms set by Underwriters Laboratories after undergoing a product safety analysis.

There could be other quality and safety seals that you can find when checking out momentary switches online, but these are the most common ones, which can already indicate that the momentary switches are high quality.

International quality seals and certifications

28. How to get your momentary switches custom made?

Some manufacturers offer customization services that allow you to create, modify, or configure your momentary switches.

When you want a custom momentary switch, you can:

• Request the kind of material you want for your momentary switches.
• Specify the diameter and other dimension measurements.
• Define the shape of the momentary switch unit or the actuator.
• Ask for a unique color or select the color combinations of your choice.
• Select your preferred illumination color, whether single, dual, or tri-color.
• Choose the symbols you want or design your own.
• Technical configurations.
• Build your momentary switch from scratch.

It’s like creating your own DIY momentary switch.

Some of these customizations may not be possible with your chosen manufacturer.

It is best to consult with them first before acquiring their services to ensure that you can get your momentary switches customized the way you want.

Symbol options for customization.

29. How can you help prolong the service and shelf life of your momentary switches?

There are ways to help prolong the service and shelf life of your momentary switches so that they can last longer and provide the best performance each time.

Below are some recommendations that are easy and very doable for you:

• Handle your momentary switches with care.

Proper handling of momentary switches prevents accidents, such as dropping them on the ground; the impact can loosen its components, causing it not to work or to demonstrate performance problems.

• Avoid using pointed objects.

The actuator of the momentary switch is built for the human finger to touch or press.

Using a sharp tool to press the actuator can cause a dent on its surface or a scratch, which can hurt the aesthetics of the momentary switch.

When this action is done frequently, the pointed object can bore a small hole through the actuator, and this may cause an electric shock to the next user.

• Adhere to the manufacturer’s recommended use.

When ordering a momentary switch, you will receive a manual or a small booklet that may contain detailed information about the switches.

It may also include instructions on how to use momentary switches, such as operation methods, mounting procedures, features, voltage ratings, environmental compatibility, and so on.

Failure to comply with these instructions may damage the momentary switches and shorten their service life.

• Occasional maintenance

Although high-quality momentary switches require almost no maintenance, it is still recommended to periodically check the performance and condition of your switch.

Look for any signs of rust or damage, which can worsen over time and lead to performance issues with the momentary switch later on.

Cleaning the surface of the momentary switch is also necessary to remove deeply embedded dirt that could enter the interior or the back of the panel.

• Store properly

It is ideal to have storage rooms for keeping your momentary switches, but if not, that is acceptable as well.

As long as you store your momentary switches in a clean, secure container placed in a dry and cool location.

If you have ordered batches of momentary switches, they come in box packaging that can be used to store the remaining switches.

In this packaging, the momentary switches are arranged in a molded tray that provides additional protection for each unit.

Even if the box packaging appears sturdy, avoid placing heavy objects on top, as the weight may eventually damage both the box and the switches.

Finally, avoid leaving your momentary switches in areas exposed to direct sunlight, which can cause discoloration or, worse, overheating leading to melting of some components.

Momentary switch storage area facility

30. What does the warranty for a momentary switch guarantee you?

A product warranty is a promise issued to you, the purchaser, by the manufacturer, detailing the conditions under which the product will be repaired or replaced within a specified period.

Manufacturers conduct rigorous quality inspections before dispatching your orders.

However, occasionally a unit may be overlooked, resulting in a defective switch.

If you receive a defective momentary switch, refer to the product warranty provided by the manufacturer.

The product warranty should accompany your order.

It should specify the steps to take when you receive a defective unit.

Typically, manufacturers will request that you return the faulty momentary switch to them.

Shipping costs may be covered by you or the manufacturer, depending on their policy.

Upon receipt, the momentary switch will be repaired or replaced at the manufacturer’s discretion.

You may need to allow several days or weeks to receive the repaired or replacement momentary switch.

The time required will depend on your distance from the manufacturer’s location.

Warranty coverage can range from 1 to 5 years, depending on the manufacturer.

While defective momentary switches are covered, damages caused by human error or natural disasters may not be included in the warranty.

If you wish to learn more about the manufacturer’s warranty coverage before purchasing, you may consult them directly.