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Electronic switches are fundamental components in electrical circuits, acting as the control points that enable or interrupt the flow of current. They are essential for powering devices, controlling functions, and ensuring safety in a wide range of applications.

## **What Are Switches?**

Switches act as a bridge, either connecting or disconnecting the flow of electrons to turn a circuit on or off. They contain mechanical terminals that connect to metal contacts. When the terminal and contact are touching, the electric switch is closed, enabling current to pass through. Meanwhile, when the terminal and contact are not touching, the open switch prevents current from passing through the circuit.

Switches are characterised by their poles and throws. Poles refer to the number of separate circuits the switch controls, while throws indicate the number of positions the switch can adopt (on, off, or alternative connections). The combinations of these are:

- SPST (Single Pole Single Throw)
- SPDT (Single Pole Double Throw)
- DPST (Double Pole Single Throw)
- DPST (Double Pole Double Throw)

## **Different Types of Switches**

The type of control switch you use in your electrical application depends on the connections you wish to make within your circuit. Switches are often grouped by the way they are operated or by their application. Here are some electrical switch types:

- **Push button switches**: These switches, also known as [push switches](https://hken.rs-online.com/web/c/switches/push-button-switches-components/push-button-switches/), are actuated by pressing a button, commonly found in applications like doorbells, remote controls, and industrial control panels.
- **Toggle switches**: With a lever that is flipped to open or close the circuit, [toggle switches](https://hken.rs-online.com/web/c/switches/toggle-switches-slide-switches/toggle-switches/) are often used in lighting controls, power supplies, and audio equipment.
- **Rocker switches**: Also referred to as [on-off switches](https://hken.rs-online.com/web/c/switches/rocker-switches-components/rocker-switches/), these switches operate with a rocking motion for applications like home appliances and automotives.
- **Rotary switches**: Commonly found in variable speed fans, dimmers, and aircraft control panels, [rotary switches](https://hken.rs-online.com/web/c/switches/rotary-switches-components/rotary-switches/) use a rotating shaft to select different contact positions.
- **Key switches**: These [electromechanical switches](https://hken.rs-online.com/web/c/switches/key-switches-selector-switches/key-switches/) require a key to operate, providing security and access control in applications like locks, ignition systems, and security panels.
- **Micro switches**: Actuated by a small force, [micro switches](https://hken.rs-online.com/web/c/switches/micro-switches-detector-switches/micro-switches/) are small, sensitive switches that are often used in precision applications, such as when a door must be shut before the power to a device turns on.

## **How to Choose the Right Switches**

Choosing the right switch involves evaluating several factors, including the electrical requirements, such as voltage and current rating, and the type of actuation needed. Other considerations include mounting style and environmental conditions. For example, if the switch will be used to monitor gas or liquid flow, a [flow switch](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/flow-switches-guide) might be a good option.

If you’re looking for a power switch company, RS Hong Kong offers a wide selection of quality switches to meet various needs so you can easily find the right switch for your application on our online store.

## **How to Buy Power Switches from RS Hong Kong**

RS Hong Kong is a trusted power switch button supplier, sourcing supplies from leading brands in various industries, such as [Schneider Electric](https://hken.rs-online.com/web/b/schneider-electric/), [APEM](https://hken.rs-online.com/web/b/apem/), and [Eaton](https://hken.rs-online.com/web/b/eaton/). Conveniently browse our extensive catalogue and filter by various criteria to find the perfect switch for your needs on our online site. 

Aside from switches, we also stock a wide range of other electrical parts and tools. Whether you’re looking to buy a [cartridge fuse](https://hken.rs-online.com/web/c/fuses-circuit-breakers/fuses/cartridge-fuses/) or a [multimeter](https://hken.rs-online.com/web/c/test-measurement/multimeters-accessories/multimeters/), we have a comprehensive selection to meet your requirements. Need help choosing the right tools? Our information articles, such as our [USB cables buyers guide](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/guide-to-usb-cables), provide the advice you need to make your choice.

## **How Delivery Works at RS Hong Kong**

RS Hong Kong understands how flexible and timely deliveries are crucial for business continuity. This is why we offer flexible delivery options for industrial electrical switches, including express and next-day deliveries, to ensure you receive your power switches promptly. For more information on delivery options, please visit our [delivery information page](https://hken.rs-online.com/web/content/services/delivery).

To further streamline your procurement process, you can also leverage our global delivery network and online ordering system to manage, track, and update your orders easily online. With our fast and reliable service, you can be assured of prompt support whenever you need it. Open an online account with us today to meet all your electric supply needs. 



Buy high-quality electrical switches from RS Hong Kong, a leading supplier of industrial power switches. Flexible and convenient deliveries available.

Electronic Switches and Power Switches | RS Hong Kong

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