APEM Keylock Switch, DP3T, 4 A 3-Way Common-Key

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APEM Keylock Switch, DPDT, 4 A 2-Way Common-Key

APEM Keylock Switch, 4 A 3-Way Common-Key

APEM Key Switch, DPST, 4 A @ 28 V dc 2-Way Flat-Key

APEM Keylock Switch, SPDT, 4 A 2-Way Common-Key

APEM Keylock Switch, DPDT, 4 A 4-Way Common-Key

APEM Key Switch, DPST, 4 A @ 28 V dc 3-Way Flat-Key


Key switches are electromechanical switches that can only be operated with the use of a key, which is then turned to different positions to break or complete the circuit. These switches act as a security measure, restricting access to equipment or processes to authorised personnel with the corresponding key. The different positions align with different states, such as 'ON' or 'OFF', giving a clear indicator of the state of the circuit.

Key switches are commonly used in applications where accidental activation or deactivation could be hazardous, or where security is a concern. Typical uses include industrial control panels, security systems and equipment requiring restricted access.

## **Benefits of Key Switches**

Key switches offer a range of benefits that make them suitable for various applications where security, safety and convenience are paramount.

### **Security**

Key switches enhance security by restricting access to authorised personnel, preventing misuse and potential damage or harm. Some security measures that benefit from key switches are:

- **Authorised Access: **Keylock switches offer a reliable way to control access to equipment or facilities by requiring a unique key for operation. Different keylock switches offer varying levels of security, with options like single-entry, double-entry or tubular keys to suit specific needs.
- **Theft Prevention: **Key switches act as a deterrent to theft by requiring a key for operation. This makes it significantly more difficult for unauthorised individuals to operate or steal valuable equipment or machinery, enhancing security and protecting assets.
- **Data Protection: **Key switches enhance data security by restricting access to sensitive information. They prevent unauthorised individuals from accessing devices or systems containing confidential data, safeguarding critical information.

### **Safety/Accident Prevention**

Key switches are essential for enhancing safety in various settings. Some methods include:

- **Isolation:** Key switches provide a reliable means of isolating equipment from power sources, ensuring that machinery cannot be accidentally activated. This helps prevent injuries and ensures a safer working environment, especially when dealing with potentially hazardous equipment.
- **Controlled Startup:** Key switches enable controlled startup procedures for machinery and equipment, particularly in industrial settings. By requiring a key for operation, they ensure that all necessary safety checks and procedures are followed before the equipment is energised, minimising the risk of accidents.

### **Convenience**

Key switches offer convenient and user-friendly operation in a wide range of applications. Some benefits include:

- **Easy Operation:** Key switches are designed for straightforward operation, requiring minimal effort to activate or deactivate a circuit or function. The simple action of inserting and turning a key provides clear and reliable control, enhancing user experience.
- **Flexibility:** Key switches offer flexibility in design and application, with various configurations and mounting styles available. This adaptability allows them to be integrated into diverse equipment and control panels, meeting specific needs and preferences.

## **Types of Key Switches**

Key switches are available in various configurations to suit different applications and circuit requirements. Here's a look at some common types:

### **SPST Key Switch**

An SPST (Single-Pole, Single-Throw) key switch has a single input and a single output. It acts as a simple on/off switch, completing or breaking the circuit when the key is turned. SPST key switches are commonly used in applications where basic on/off control is needed.

### **SPDT Key Switch**

An SPDT (Single-Pole, Double-Throw) key switch has a single input and two outputs. It allows for switching between two different circuits or states with a single key. SPDT key switches are often used in applications like selecting between different power sources or controlling the direction of a motor.

### **DPST Key Switch**

A DPST (Double-Pole, Single-Throw) key switch has two inputs and two outputs. It's essentially like two SPST key switches in one, allowing for simultaneous on/off control of two separate circuits. DPST key switches are commonly used in applications where two circuits need to be controlled together.**

DPDT Key Switch**

A DPDT (Double-Pole, Double-Throw) key switch has two inputs and four outputs. It essentially acts as two SPDT key switches combined into one, allowing for simultaneous control of two separate circuits. DPDT key switches are often used in complex applications requiring multiple switching actions, such as controlling the power supply to two separate devices.

### **NO Key Switch**

An NO (Normally Open) key switch has contacts that are open in their default state. When the key is turned, the contacts close, completing the circuit. NO key switches are often used in security systems and safety applications.

### **NC Key Switch**

An NC (Normally Closed) key switch has contacts that are closed in their default state. When the key is turned, the contacts open, breaking the circuit. NC key switches are commonly used in emergency stop buttons and alarm systems.

### **Round Key Switch**

Round key switches feature a round keyway and are often used in applications requiring a more traditional or aesthetically pleasing design. They are commonly used for automotive applications such as ignition switches, with [push button switches](https://sg.rs-online.com/web/content/discovery/ideas-and-advice/push-button-switches-guide) being used for car radios and windows.

### **Tubular Key Switch**

Tubular key switches utilise a cylindrical key with multiple internal cuts for enhanced security. They are often used in vending machines, security systems and applications requiring higher levels of protection against unauthorised access.

### **Fire Alarm Key Switch**

Fire alarm key switches are specialised key switches used in fire alarm systems to activate or deactivate alarms, reset the system or initiate other functions. They often feature a distinctive red colour and are designed to be easily accessible in emergency situations, ensuring prompt response and control during fire incidents.**

Lock Ignition Switch**

Lock ignition switches — also known as automotive key switches or automotive ignition switches — are used in vehicles to start the engine, control accessories and provide security. They typically have multiple positions, including "off," "accessories," "on," and "start."

## **Applications of Key Switches**

Key switches find applications in diverse industries and settings where security, safety and controlled access are paramount.

### **Industrial Applications**

In industrial settings, key switches are crucial for controlling machinery, managing processes and ensuring safety, including:

- **Machinery Control:** Key switches are commonly used to control access and operation of industrial machinery, such as presses, conveyor belts and robotic systems, preventing unauthorised use and ensuring safe operation.
- **Process Control:** Key switches integrated into control panels and systems manage industrial processes, ensuring only authorised personnel initiate or modify operations. For example, they can be used with [light switch timers](https://sg.rs-online.com/web/content/discovery/ideas-and-advice/choosing-light-switch-timers) to control lighting schedules, enhancing energy efficiency.
- **Emergency Stop Switches:** Key-operated emergency stop switches provide a secure way to quickly shut down machinery in hazardous situations, preventing accidents and protecting workers.

### **Automotive Applications**

Key switches play a vital role in automotive applications, providing security and controlling essential functions, such as:

- **Ignition Systems:** Automotive ignition switches, also known as lock ignition switches, are used to start vehicles and control various electrical accessories.
- **Alarm Systems:** Key switches are used in car alarms and immobilisers to deter theft and enhance vehicle security.

### **Security Systems**

Key switches are essential components in various security systems, providing controlled access and protection. These include:

- **Access Control:** Key switches are used in access control systems to restrict entry to buildings, rooms or secure areas, ensuring only authorised personnel can enter.
- **Security Alarms:** Key switches can arm or disarm security alarm systems, providing a secure way to control and monitor premises.
- **CCTV Systems:** Key switches can be used to activate or deactivate CCTV systems, providing control over surveillance and recording functions.

## **Get Your Key Switches from RS Singapore**

As a trusted supplier of high-quality electrical components — including [cable glands](https://sg.rs-online.com/web/c/cables-wires/cable-glands-fittings/cable-glands/) and [power relays](https://sg.rs-online.com/web/c/relays-signal-conditioning/relays/power-relays/) — RS Singapore offers a wide range of key switches from leading brands like [APEM](https://sg.rs-online.com/web/b/apem/) and [Marquardt](https://sg.rs-online.com/web/b/marquardt/). Whether you need a simple key switch for basic on/off control or a more specialised keylock switch for security applications, we have the perfect solution for your needs.

Explore our selection online, add your desired key switches to your cart and proceed through our secure checkout process. We offer various payment options for your convenience. Enjoy fast delivery across Singapore, with options to suit your timeframe and budget. 

For detailed information on delivery services and costs, visit our [Delivery Information](https://sg.rs-online.com/web/content/support/all-articles/delivery) page. Enhance the security and functionality of your equipment with reliable key switches from RS Singapore — order yours today!



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