Langir Normally Open Push Button Switch Stable Quality to Support Your Business

Langir normally open push button switch is the most popular pushbutton in the world. Langir believes that we will be your best partner for normally open push button switch if you are looking for this tool.

Langir normally open push button switch is usually called NO pushbutton switch. Our metal button switch is mainly composed of the two most important functions of NO and NC, and extended to other functions.

In Langir products family, Normally open push button switch has vandalproof switch, piezo & capacitive switch. They all have this characteristic of NO, 1NO1NC or 2NO2NC.

For piezo normally open push button switch, we especially provide your fully illuminated plastic piezo switch with normally open function.

Langir normally open push button switch has a lot of applications. For example, For door bell system, if you press langir normally open pushbuttons, the current is passed and switched on, the bell will sound—dingdong. You could see this Langir normally open push button switch everywhere such as bank, kitchen, hotel, supermarket, the mall, railway, boat etc.

The technology we provide is your strong backing. As a leading normally open pushbutton switch supplier, we could help you to choose the correct switches. Contact us now for a quick quote.

Normally Open Push Button Switch — FAQ Guide

In this complete guide, you will learn interesting facts about the normally open push button switch.

You will also learn its inner workings, its variations, different styles, and the other essential information that you should know about normally open push button switches.

Aside from that, you will also find out the applications you can use the normally open push button switch to and other things that you’ll be thankful that you learned today with this guide.

So, before you purchase a normally open push button switch, read this guide to know all the important things that’s best to know about it.

1. What is a normally open push button switch?

A normally open push button switch is a type of push button that does not make an electrical contact during its default state. You could call it as push button NO.

But when you press the button of the switch, the contacts connect and the circuit becomes closed.

Fun Fact: The first electronic push button system was a telephone.

On November 18, 1963, Bell Telephone offered the first telephone with an electronic push button system to their customers in Pittsburgh, Pennsylvania.

It was called the Western Electric 1500 which has only 10 push buttons with numbers from 0 to 9.

Then another version was released by the same telephone company, the Western Electric 2500 with 12 push buttons with the addition of asterisk and number sign buttons.

Although this was released in 1963, the majority of the customers still had rotary telephones.

The push button telephone only reached its peak sales in the 1970s and most of the customers were business owners.

Normally open push button switch

2. What is the story behind the development of normally open push button switches?

The story behind the normally open push button switch can be traced back to the first invention of “quick-break technology” in 1884 by the English electrical engineer, John Henry Holmes.

When Holmes developed this technology, it immediately replaced the street lights in which arc lamps were previously used.

Both the arc lamps and their predecessor, the gas illuminated lights, had issues that posed health and safety risks to the public.

Arc lamps were found to be emitting dangerous UV rays which can affect people exposed to its light.

People are prone to get the bad effects of UV rays since arc lamps are used for street lights.

But thanks to the Holmes invention it eliminated the use of arc lights in public places.

The first light push button switch first appeared in homes back in 1910 as the electricity grid expanded.

And in the 1950s, the push button switch technology was widely used in different applications and many industries.

Just a decade after, many home household appliances have push button controls integrated for their functions.

The Bell telephone

3. What are the favorable circumstances of using the normally open push button switches?

There are many benefits of using the normally open push button switches and some of them are the following:

• They occupy less space in any machines, panel, switchboard, etc.
• Once they are installed, they cannot be removed easily.
• They are compact and easy to use.
• Mostly more affordable than other types of switches.
• Some types are made for high voltages.
• They help avoid short circuits.

There are other benefits of using the normally open push button switch that you can surely discover when you are already using it.

Also, it is widely available around the world, so you can be confident that the normally open push button switch is available in your area.

Otherwise, you can simply order online and have them delivered to your doorstep.

4. What are the differences between a normally open push button switch and a normally closed push button switch?

Some people get confused with the normally open push button switch and the normally closed push button switch, Normally closed push button switch but they work differently.

Here is a table describing their differences.

Difference between normally open push button switch and normally closed push button switch.

5. How does a normally open push button switch mechanism work?

The normally open push button switch mechanism works as depicted in the figure shown above:

The push button switch normally open has an electromagnetic absorption device inside it.

This device is energized and generates magnetism when an operator presses the switch’s button or actuator.

At the same time, the absorption device connects the circuit, therefore, triggering the assigned

function to operate the wired device or equipment.

When the operator presses the switch’s actuator once again, the switch returns to its default normally open state.

Normally open push button switch working principle.

6. What is the structure of a normally open push button switch?

A normally open push button switch has the following parts:

• The actuator — This is the button that you will press to activate the switch, hence called the actuator.
• The shell/body — This is the material that encloses or houses the mechanisms of the normally open push button switch.
• The terminals/pins — These are the small rods that protrude at the bottom of the normally open push button switch where wires are soldered or screwed.
• LED — This emits light when the normally open push button switch is pressed or stays on depending on how it was wired.
• Spring — This is found inside the normally open push button switch and enables the movement of the actuator while being pressed down and springs back up to return to its resting state.
• Movable contacts — This is the piece that is positioned under the actuator that also moves when it is pressed down.
• Stationary contacts — These contacts do not move and they are situated at the bottom part of the internal mechanism of the normally open push button switch.

Parts of normally open push button switch.

7. What is the symbol for a normally open push button switch?

The symbol for a normally open push button switch is depicted in the figure here:

Normally open push button switch symbol.

8. What are the head shapes available for the normally open push button switch?

There are different head shapes available for the normally open push button switch.

But this also depends on the manufacturer, as not every manufacturer provides different push button head shapes.

The head shapes refer to the shape of the top side of the push button switch and mostly describe the shape of the actuator or the button that you press.

The following are the different head shapes depending on their availability:

• Flat head.
• Raised.
• Dome shaped.
• 倒角头

There may be other head shapes available such as the square head, rectangle head, etc.

This means that you can choose whichever you like best for your application.

9. What are the specifications of a normally open push button switch?

Normally open push button switch models.

Just like other switches, there are specifications for the normally open push button switch.

They are usually categorized as follows:

• General information.

This details the product characteristics and features, which includes the type of switch, dimensions of the switch.

• Product number definition.

This defines the model number’s legend that represents the switch’s physical components and characteristics, which includes any of the following:

1. • 1. Illuminated/non-illuminated.
     2. Illumination color.
     3. Head or actuator shape.
     4. LED operating voltage.
     5. Number of contacts or pins.
     6. Switch action (momentary or latching).
   • Technical data.

This includes specific ratings and specifications of the switch and can include any of the following:

• 1. 1. 1. Type of switch.
        2. Actuator options
        3. Terminal
        4. Maximum switch rating
        5. Contact resistance
        6. Insulation resistance
        7. Dielectric strength
        8. 工作温度
        9. Mechanical life
        10. 电气寿命
        11. Contact material
        12. Torque
        13. Operating pressure
        14. Protection level
        15. The material used for:
            • Actuator
            • Body
            • Base
• Environmental specification

This describes the environmental condition that the normally open push button can handle or the conditions where it should not be used.

10. Does the normally open push button switch have options for you to choose from?

是的，当然可以。.

Some manufacturers offer a variety of normally open push button switch options.

This will enable you to find the right normally open button for your application when it comes to the design, size, and functions.

Some of the options available are the following:

• Domed head normally open push button switch
• Ring illuminated normally open push button switch
• Capacitive normally open push button switch

You can find other options online that you can use for your application.

Examples of capacitive switches

11. How many stationary contacts does a normally open push button switch have?

The number of stationary contacts of a normally open push button switch can be 2, 4, 5, 6 or more.

These are also known as terminals or pins and each pin serves specific functions.

A 2-pin push button switch would have C or common terminal and the NO terminal.

While a 4-pin push button switch would have the following terminals:

• Positive
• Negative
• Power supply
• To device

A 5-pin push button switch would have the following terminals:

• Positive
• Negative
• Normally open
• Normally closed
• Common

And a 6-pin push button switch would have the following:

• Positive
• Negative
• 2 Normally open terminals
• 2 Normally closed terminals

However, these functions would depend on the switch’s type as some switches can be NO or NC as seen on the 5-pin push button switch.

Also, there are other switches made to have more than the number of pins mentioned above.

Generally, when you order a push button switch, you will receive an instruction manual or wiring diagram with the illustration and description of each terminal to guide you with the wiring process.

But in any case that your switch doesn’t come with the instruction manual, you can contact your manufacturer if they can send you the material.

Otherwise, you can also refer to the self-help tools such as the tutorial videos, forums, or the website’s FAQ on how to wire the push button switch.

A sample of 7-pin push button switch wiring guide

12. Which stationary contacts are better for the normally open push button switch?

This would depend on you as the user.

Some people would prefer soldering the terminals while others prefer the screw terminals.

In any type of stationary contact, the normally open push button switch will still operate the same way.

However, should you choose solder terminals, you will need to ensure that you follow the right procedure in soldering them as well as the level of heat of the soldering gun.

High levels of heat may melt the terminals down to the plastic encasing and leave the push button switch unusable.

13. Is it a normally open momentary switch(NO momentary switch)?

Yes, a normally open push button switch can be momentary open switch but you can also find latching types too.

A momentary type of push button switch will maintain its “on” state while you press the button while the latching push button switch type will be “on” when pressed once and will be “off” when pressed once again.

It is better that you can determine which function you would like to have for your normally open push button switch that will be suitable for your application to avoid purchasing the wrong type of switch’s function.

14. Is the normally open push button switch SPST?

Yes, but a normally open push button switch is also SPDT or DPDT.

The switches are available in stainless steel, nickel-plated, or aluminum alloy. You can freely combine the actuator head and housing, such as a red housing with an aluminum alloy head or a yellow head with a stainless steel housing. This flexibility allows seamless integration with your machine's color scheme, offering an optimal solution. SPST switches mean single pole and single throw is an ideal choice if you need a simple on and off switch. For example: 对于无照明的Langir按钮开关，我们建议, L16系列, V19 series, V22 series, 等。.

While SPDT switches mean single pole and double throw which means the current from the input circuit is routed to one of the two output circuits. For example: L19A series

SPDT types are also known as changeover switches or A/B switches because you have two options, which are the A option and the B option.

While the DPDT switch type, which means double pole and double throw, has 6 terminals and can be described as two SPDT types.

A DPDT type has one actuator that controls it and is commonly used in reversing phase or polarity.

The SPST, SPDT, and DPDT are the common types of switches you can find in the market; however, you can also find types with more poles or throws such as a rotary switch.

15. Can a normally open push button switch can carry current when not pushed?

No, a normally open push button switch does not conduct current when its actuator is not pressed.

This is why it is called a normally open push button switch: its internal contacts are open in the default state, meaning no current flows.

Current only flows or connects when the actuator is pressed and the contacts make contact.

16. How much pressure is required to activate a normally open push button switch?

A normally open push button switch does not require much pressure to activate.

High-quality push button switches are easy to press and, for latching types, produce a clear clicking sound.

The resistance is appropriately set to allow easy pressing of the actuator.

The pressure needed to activate a push button switch is measured in Newtons (N).

A high-quality normally open push button switch typically has an actuation pressure of 5 N.

For comparison, typing on a keyboard can generate up to 2.54 N of force, though only 0.47 N is required.

This means pressing a switch button requires more force than pressing a computer keyboard key, but it is still relatively light—about 510 grams, equivalent to the weight of 100 US nickels.

The required activation force helps prevent accidental or erroneous triggering.

17. Can a normally open push button switch be used for residential electrical switches?

是的，当然可以。.

Residential electrical switches were among the early applications of normally open push button switches.

However, it is essential to select a switch with the appropriate current rating to match your power supply voltage.

It is strongly recommended to consult a licensed electrician to avoid potential injuries.

You only need to provide your ideas, and the electrician will handle the work.

The work may involve installing relays, circuit breakers, or other components required for your home's electrical switches.

Electrician working on a circuit breaker.

18. Can a normally open push button switch be used on a boat in a saltwater environment?

This depends on the switch's level of protection.

If the switch is labeled waterproof or water-resistant, it may be suitable for saltwater environments, specifically for boat control switches.

Non-waterproof push button switches can allow water ingress, leading to internal rust, corrosion, and eventual failure.

19. Are NO NC push button switches available?

Yes, NO NC push button switches are available in series such as L19A, L16, L16T, L22, and L25. They are commonly used in various devices and home appliances. Prices vary based on functions and models. This type of switch allows flexibility in choosing between normally open or normally closed installation when uncertain.

20. Can a normally open push button switch be installed as a car starter?

It can activate a solenoid but is generally insufficient to start an engine directly.

You may need an alternative solution, 汽车按钮开关 as not all normally open push button switches have the specifications required to start an engine.

Classic car start and stop push button.

21. Is a normally open push button switch suitable for horn buttons?

Yes, they are ideal for horn buttons.

Some people have successfully replaced their vehicle's horn button with a momentary normally open push button switch.

22. Is there an ideal plate for a normally open push button switch?

Yes, there is.

To install a normally open push button switch properly, a sufficiently sturdy plate or panel is required.

You can purchase switch plates with pre-drilled holes online or use a recommended 4.0 mm thick panel and create holes with a hole saw.

Ensure the hole diameter matches the push button switch diameter.

Some adjustments may be necessary to achieve a snug fit.

23. Will a tightening nut be included when ordering a normally open push button switch?

Yes, a tightening nut is typically included, and sometimes an extra one, depending on the manufacturer.

The tightening nut is fastened from the back of the switch through its grooves.

This secures the switch in place and prevents it from falling.

An O-ring is also included to seal the gap between the actuator head and the panel surface.

Sample wiring diagram.

24. What is the connection diagram for a normally open push button switch?

An example connection diagram for a normally open push button switch is shown in the following figure:

25. How much space does a normally open push button switch occupy behind the panel?

A normally open push button switch does not occupy much space behind the panel.

On average, they occupy at least 1.61 inches (40.89 mm), while short-body types occupy about 0.762 inches (19.35 mm).

26. Can a normally open push button switch be used as a doorbell button replacement?

是的，可以实现。.

Doorbell buttons were among the earliest applications of push button switches.

A momentary normally open push button switch can be used as a doorbell button.

Alternatively, you can use a modern doorbell push button switch, which is specifically designed for this purpose.

27. Can a connector be obtained for a normally open push button switch?

Yes, connectors for normally open push button switches are available.

These are typically made of PVC with integrated cables, eliminating the need for soldering.

Simply plug the connector into the momentary push button switch.

Ensure you purchase the correct connector for your switch—for example, a 5-pin switch requires a 5-pin connector.

28. Does a normally open push button switch come with pigtail connectors?

Not all manufacturers include pigtail connectors with their push button switches.

It is advisable to check product images and descriptions to confirm whether pigtail connectors are included.

Pedestrian crossing normally open push button switch.

29. Is a normally open push button switch rustproof?

You can find normally open push button switches that are made from 304 or 316 stainless steel which are rust-proof materials.

These are the metal push button switches that are made from either of the two kinds of stainless steel.

The stainless 304 is made up of an 8% nickel alloy and 18% chromium which makes it resistant to oxidation.

While stainless type 316 is made up of 2% molybdenum, 10% nickel, and 16% chromium which makes it resistant to rust and an excellent material for push button switches.

30. Can you use a normally open push button switch as a gate opener and closer?

Yes, you can use a normally open push button switch as a gate opener as long as the voltage rating of the switch can handle the voltage from the power source to avoid overheating the switch.

31. Can a normally open push button switch be easily corroded with water ingression?

Some switches are not designed to be sealed, which is why water ingression can occur, leading to corrosion of the switch's internal components.

That's why it is better to choose a high-grade waterproof momentary switch, normally open, that is designed to be sealed to prevent water from entering.

This also means that the normally open push button switch will have a longer service life.

32. Can the normally open push button switch easily build up oxidation?

Oxidation is a chemical reaction of a metal object when exposed to oxygen and moisture.

The chemical reaction causes the metal to corrode or oxidize, forming a metal oxide on the metal's surface.

If the normally open push button switch is made with 304 or 316 stainless steel, this chemical reaction is less likely to happen.

You can be assured that the switch will last longer and will function normally even when it's frequently exposed to moisture.

33. Is a normally open push button switch easy to install and ready to use immediately?

One of the advantages of normally open push button switches is that they are easy to install and can be used immediately.

The terminals are labeled, allowing you to solder the wires and know where to connect them.

Alternatively, you can refer to the wiring guide included in the package to assist you during installation.

Computer power switch

34. Can you use a normally open push button switch for a computer power button?

Yes, you can use a normally open push button switch for a computer power button.

Some types will work excellently as a computer power button, such as the reset push button switch or the power push button switch..

35. How far do the grooves of a normally open push button switch go?

This depends on the type of normally open push button switch, as some are designed to be longer for specific purposes.

For example, a standard normally open push button switch would have a groove length of 0.717 inches or 18.21 millimeters, while a short-body type would have 0.496 inches or 12.59 millimeters.

36. Can you paint over a normally open push button switch?

Although painting over a normally open push button switch is not advisable, it is possible.

However, it is recommended to simply choose the right color, as there are various colors available online.

Painting over a push button switch could cause its quality to deteriorate and void the manufacturer's warranty.

37. Will a normally open push button switch last long in terms of mechanical life?

High-quality normally open push button switches have a longer mechanical life compared to other switches.

They can last for up to 1 million mechanical life cycles, and this lifespan can be extended when they are used under appropriate conditions.

38. What is the typical current rating of a normally open push button switch?

Similar to other switches, a normally open push button switch can be rated at 3, 5, 8, 10 amps, and so on.

This information is usually available on the product label or in its specifications.

Some types can handle high current, such as the high current push button switch like the L19B series,, L22B series,, L19Y series..

39. Does the normally open push button switch have a lock function?

This depends on whether the normally open push button switch has a built-in mechanical lock function.

You can check the label or product description to see if it has this feature.

The self-lock function works such that when the button is pressed, it will not return because it is locked.

You will need to press the normally open push button switch again, this time a little further, for it to unlock and return.

Firemen elevator buttons

40. Can you use the normally open push button switch for call buttons?

Yes, they work excellently for call buttons.

You can use a momentary switch, normally open, to replace a broken call button or perhaps create your own.

41. Can you replace light switches with a normally open push button switch?

Before toggle switches, push button switches were widely used for light switches.

This means you can certainly replace your old light switches with a more modern and stylish normally open push button switch.

42. Can you customize the normally open push button switch to ones that are not available on the market?

Yes, by inquiring directly with the manufacturer, you can discuss your preferred specifications for a normally open push button switch to make yours unique and perfectly compatible with the intended application.

Remember that not all manufacturers accept customization requests; you need to confirm with them if they do.

43. Why are there different colors of normally open push button switches?

You may have noticed that some normally open push button switches have different colors.

每种颜色都有其用途，有助于轻松识别开关的用途。.

这有助于避免误按错误的按钮开关。.

示例如下：

44. 如何为您的应用选择合适的常开按钮开关？

为帮助您选择合适的常开按钮开关，您可以参考以下问题作为指导：

• 常开按钮开关的用途是什么？
• 您希望常开按钮开关如何工作？是常开瞬时按钮还是常开自锁按钮？
• 您是否有偏好的尺寸、颜色和执行头类型？
• 您偏好带指示灯还是不带指示灯的类型？
• 您需要常开瞬时开关具备防水或防破坏功能吗？
• 您需要的常开按钮开关额定电流是多少？12伏常开瞬时开关是否适用于您的设备？
• 您偏好哪种接线端子类型？焊接式还是螺丝式？

虽然这些问题有助于您选择合适的常开按钮开关，但您也可以思考对您最重要的因素，以确保对所选的开关不会后悔。.

45. 如何修复损坏的常开按钮开关？

修复损坏的常开按钮开关可能具有挑战性，因为内部组件不易更换。.

最佳方式是联系制造商并说明您的问题。.

如果产品在保修范围内，您将获知如何退回常开按钮开关以及维修涉及的其他费用。.

您还将获知维修可能需要多长时间。.

46. 为什么工业中使用常开按钮开关而非标准开关？

这是因为常开按钮开关比其他标准开关更易于操作。.

激活常开按钮开关只需按下或触摸，例如电容开关和压电开关的触摸感应功能。.

您无需拉动或旋转常开按钮开关，避免了紧急情况下可能造成混淆的操作。.

许多行业（如制造业）非常重视确保生产始终准时进行。.

不允许任何延误，因为这可能导致经济损失，对业务造成损害。.

这就是为什么大多数行业首选常开按钮开关，因为它们更可靠、更耐用且更易于操作。.

常开按钮开关翻盖护罩

47. 常开按钮开关有哪些可用部件？

常开按钮开关有一些可用于不同目的的部件。.

这些也被称为按钮开关附件，示例如下：

• 按钮防转环——防止开关旋转并保持其位置固定。.
• 按钮防护罩——保护开关免受灰尘和水等外部因素的影响。.
• 按钮透镜——可用作开关的保护或颜色编码，以指示其功能。.
• 按钮螺母——用于固定开关位置，通常随开关附带，但也可单独订购。.
• 按钮面板密封件——也可作为开关的附加保护。.
• 按钮插座——带有连接线的开关连接器，可与开关连接。.
• 按钮翻盖护罩——保护盖，防止意外激活或指示开关具有重要功能。.

您可以在线找到许多其他部件或附件，可为常开按钮开关增加保护或仅作装饰用途。.

48. 常开按钮开关会自行开启吗？

常开按钮开关需要一定程度的压力才能激活或开启。.

但某些常开按钮开关（如电容式）可通过触摸头部来开启。.

常开按钮开关保修

49. 常开按钮开关的保修期是多久？

常开按钮开关的保修期取决于制造商。.

一些制造商为其产品提供1年、2年或3年的保修。.

此信息可在产品包装、说明书或制造商网站上找到。.

作为消费者，了解制造商提供的保修期限并理解保修范围非常重要。.

This can help you get your normally open push button switches repaired if they become faulty within the warranty period.

Contact your manufacturer and advise them of the faulty switches.

You will have to send them back to the manufacturer to repair it or replace it with a new batch of normally open push button switches, which is entirely up to them.

Returning a faulty switch can be a hassle, so to ensure that you will not face this issue, you need to look for a high-quality normally open push button switch and a manufacturer with a high trust rating.

Usually, these are the manufacturers that have been making push button switches for many years.

They have been in the business enough so you can be assured that their products are high quality from the many years of experience.

50. What can you do to maintain the quality of the normally open push button switch?

Although, high quality normally open push button switches are usually low maintenance.

However, normally open push button switch does help a lot when you take care of them as well.

Taking care of them helps maintain their original appearance and ensure longer mechanical life.

Here are some recommendations you can follow to help maintain the quality of your normally open push button switches:

• Avoid hitting them with sharp objects — Although they are vandal proof, sharp objects can leave a nasty mark or deform the switch which can cause it not to work anymore.
• Regularly clean its surface — They may be dustproof but sometimes wiping them with a clean wet cloth can remove stubborn dirt and help return their shiny appearance.
• Avoid using them beyond what is recommended — This pertains to using the switch in a power supply that is above its capacity which can cause the switch to heat up and stop functioning.
• Avoid exposing them to water when they’re not waterproof — Some normally open push button switches in the market are not waterproof unless specifically labeled as waterproof, water-resistant, or marine waterproof.
• Avoid putting them in direct sunlight — The harmful UV rays can affect the appearance of the normally open push button switch such as fading in color and the internal contacts may no longer work too due to prolonged heat exposure.
• Store them properly to prolong their shelf life — If you have a set of switches that are not going to be used yet, you can place them back inside their original box or any other box, then in a dry and cool area.