NKK Illuminated Push Button Switch, Momentary, Panel Mount, SPDT, Yellow LED

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Push button switches, also known as push switches, are one of the most common types of electrical switches used today. These versatile components are used in a wide range of applications, from everyday household appliances to industrial machinery.

With their straightforward operation and robust construction, push buttons are a popular choice for controlling electrical devices, activating alarms, and initiating various control sequences.

Here at RS HK, we offer a comprehensive selection of high-quality illuminated and non-illuminated electronic and mechanical push button devices, in a range of shapes, sizes, and colours. Regardless of whether you’re designing a new project or simply maintaining an existing installation, we have the right push button switch for you.

## **How Do Push Button Switches Work?**

A push button has two main components: the button itself and the internal switching mechanism. When pushing the button, it forces the plunger to move, which in turn engages or disengages the internal contacts, thereby completing or breaking the electrical circuit. This mechanism is consistent across various types, whether you're dealing with a mechanical push button device or an electronic push button switch.

## **Different Types of Push Button Switches**

Push button switches come in a variety of types, each with unique characteristics and features. Some of the most common types of push switches are:

### **Momentary Push Button Switch**

Momentary push buttons, also known as spring return buttons, are a type of switch that requires continuous compression. They will turn on when the user applies a force (usually your finger) to the switch button and will only stay on while the switch button is compressed or pushed. Once the force is removed, momentary switches will spring back and return to their original off position.

Momentary switches will always have brackets around the momentary position to help with identification. For example, (On)-Off-(On) indicates that the switch is momentary in the "On" position, while (On)-(Off) means the switch is momentary in the "Off" position.

### **Latching Push Button Switch**

Latching push button switches, also known as maintained or stay-put push buttons, are a type of switch that does not require continuous compression. They will turn on when the user applies a force (usually your finger) to the switch button and will remain in the on position. It is only after the user compresses the switch button again that the switch will unlatch and return to its original off position.

### **Illuminated Push Button Switch**

Illuminated push on and off buttons incorporate a light source, typically an LED, that lights up when the button is pressed. illuminated switches are often used in low-light or dark environments and are ideal for applications where a visual indication of the switch's status is required.

## **Push Button Switches Applications**

Push switch devices are incredibly versatile and find applications across various industries and devices. Here are some common uses:

- **Industrial Machinery:** Push button switches activate or halt machine functions, control power, and trigger emergency stops in industrial settings, essential for operational safety.
- **Consumer Electronics:** Press button switches are used in devices such as cameras and televisions to control power and function settings, ensuring user-friendly interface interactions.
- **Automotive Systems:** Within automotive applications, button switches contribute to functionality such as ignition systems, window controls, and emergency lighting. Their robust design ensures reliable operation under the harsh conditions of automotive environments.
- **Building Automation:** Push switches facilitate the [automation of systems and equipment](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/future-automation-guide) in buildings, such as [light switches](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/light-switch-timers-guide), access doors, and alarm systems. They provide a simple yet effective way to operate or manage building functions.
- **Telecommunications Equipment:** These switches are used in devices such as network routers and broadcast equipment to reset systems or adjust settings without needing complex commands.

You can find more information in our [push button switch guide](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/push-button-switches-guide). 

## **Key Specifications to Consider**

When buying a push button switch, it's important to assess all relevant specifications to choose a model that will perform optimally in your intended application. Here’s a quick look at the critical factors to consider:

### **Mounting Type**

Mounting for push button switches refers to the installation method, which affects integration and access in various setups.

**Popular Mounting Types:**

- Panel
- Through Hole
- PCB
- Surface Mount
- Cable Mount

### **Voltage Rating**

The voltage rating indicates the maximum voltage the press button switch can handle, ensuring compatibility with your system's voltage levels.

**Popular Voltage Ratings:**

- 125V ac
- 250V ac
- 125/250V ac
- 250 / 125V ac
- 50V dc
- 60V dc

### **Current Rating**

Current rating refers to the maximum current the push button switch can safely conduct, important for preventing overload and ensuring durability.

**Popular Current Ratings:**

- 125 mA @ 48 V dc
- 200 mA @ 48 V dc
- 250 mA @ 12V dc
- 5 A @ 250 V ac

### **Contact Material**

Contact materials impact the button switch's conductivity and resistance to wear.

**Popular Contact Materials:**

- Brass
- Copper
- Fine Silver
- Gold

### **IP Rating**

IP rating specifies the level of protection against dust and moisture, a critical factor in determining the push switch's environmental resilience.

**Popular IP Ratings:**

- IP65
- IP66
- IP67
- IP68

## **How to Order Push Button Switches From RS HK?**

[RS HK](https://hken.rs-online.com/web/) is a trusted supplier of push button switches, sourcing only from leading brands such as [Schneider Electric](https://hken.rs-online.com/web/c/switches/push-button-switches-components/push-button-switches/?applied-dimensions=4294965589), [Siemens](https://hken.rs-online.com/web/c/switches/push-button-switches-components/push-button-switches/?applied-dimensions=4294965546), [APEM](https://hken.rs-online.com/web/c/switches/push-button-switches-components/push-button-switches/?applied-dimensions=4292069318), and our very own [RS PRO](https://hken.rs-online.com/web/c/switches/push-button-switches-components/push-button-switches/?applied-dimensions=4291762234) brand. Here's how to order from us:

1. **Browse Our Catalogue:** Look through our list of offerings and refine your search by applying filters for specific brands or features to locate the button switch you need quickly.
2. **Click the Product:** Click on your chosen push button switch to view more detailed information, including the type and other specifications.
3. **Add to Your Order**: For the push button switch you wish to purchase, adjust the quantity if needed, and then add it to your cart.
4. **Proceed to Checkout:** Review your cart, make any final adjustments, and then proceed to checkout.

Follow these quick steps to order high-quality push button switches from RS HK today. You can also find other essential electronic components, such as [electronic alarms](https://hken.rs-online.com/web/c/automation-control-gear/automation-signalling/electronic-sounders/), [PLC controllers](https://hken.rs-online.com/web/c/automation-control-gear/plcs-hmis-industrial-computing/plcs-programmable-logic-controllers/), [power plugs](https://hken.rs-online.com/web/c/connectors/mains-dc-power-connectors/plug-sockets/), and more.

## **How Delivery Works at RS HK**

For a better understanding of our push button switch delivery process in Hong Kong, here's a quick breakdown of the options available:

- Standard Delivery: We ensure your orders are delivered promptly, with services tailored to your needs.
- Scheduled Delivery: For specific requirements, you can arrange delivery in advance to suit your schedule.

For more information on our delivery services and fees, please visit our [delivery page](https://hken.rs-online.com/web/content/services/delivery) or contact our customer service team.



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NKK Push Button Switches

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