Power Relays

Power relays are electromechanical devices that are used to control the flow of electrical power in a circuit. They are commonly used in industrial and commercial applications to control large electrical loads, such as motors, heaters, and lighting systems.

How do Power Relays Work?

Power relays consist of a coil, which generates a magnetic field when a current flows through it, and a set of contacts that are mechanically switched by the magnetic field. When the coil is energised, the contacts close, allowing current to flow. When the coil is de-energized, the contacts open, breaking the circuit and stopping the flow of current.

Types of Power Relays

Power relays are available in a variety of configurations, including single-pole, double-pole, and three-pole versions. They may also include auxiliary contacts, which can be used to monitor the status of the relay or to control other devices in the circuit. Additionally, power relays may have features such as time delays or surge suppression to provide additional protection and control.

Understanding the different types of power relays is key to selecting the right solution for your project, ensuring optimal performance, reliability, and safety in your electrical circuits. Whether you're looking for simple on/off control or complex multi-circuit switching, there's a power relay designed to meet your requirements. When looking at different types of power relays, consider the following key categories:

Mounting Types for Power Relays

• Latching Relay: Latching relays maintain their position even after the actuating force is removed, using a mechanical latch or magnetic hold. They are energy-efficient, as they do not require continuous power to maintain their state.
• Non-Latching Relay: Non-latching power relays return to their default position when the actuating force is removed. They are ideal for applications requiring a default "off" state for safety or other reasons when power is lost.
• Plug-In Relay: Plug-in power relays are designed for easy installation and replacement, fitting into sockets or bases. They offer convenience and flexibility, making them suitable for applications where quick maintenance or upgrades are necessary.
• PCB Mount: PCB (Printed Circuit Board) mount power relays are directly soldered onto the circuit board, providing a compact and reliable connection. These relays are commonly used in electronic devices and applications where space is limited.

Pole Configuration

• Single Pole: Single pole relays control one circuit with a single switch mechanism. They are commonly used for simple on/off operations and are ideal for applications where only one electrical path needs to be controlled.
• Double Pole: Double pole power relays have two separate switches that operate simultaneously, allowing them to control two independent circuits. This configuration is useful for applications requiring simultaneous control of multiple circuits, providing greater flexibility and functionality.
• Three Pole: Three pole power relays feature three switches that can control three independent circuits at the same time. They are typically used in more complex applications where multiple circuits need to be managed concurrently.

Voltage

• 12 Volts: 12V relays are commonly found in DC (Direct Current) systems, particularly in automotive and small electronic applications. They are well-suited for moderate power applications.
• 24 Volts: Widely used in industrial control systems, 24V relays provide reliable performance in automation and machinery. They can be found in both AC (Alternating Current) and DC (Direct Current) systems.
• 120 Volts/240 Volts AC: Standard in household appliances, HVAC systems, or heavy-duty industrial equipment and commercial applications, these power relays are designed to manage high voltage loads efficiently.

Power Relay Applications

Power relays are used in a wide range of applications where electrical power needs to be controlled. Some common examples of applications where power relays are used include:

• Motor control: Power relays are used to control the operation of electric motors in various industrial and commercial applications, such as pumps, conveyors, and HVAC systems
• Lighting control: Power relays are used to control lighting systems, such as streetlights, outdoor lighting, and indoor lighting in commercial and industrial buildings
• Heating and cooling systems: The operation of heaters and cooling systems, such as air conditioners and refrigeration units can be controlled by power relays.
• Power distribution: When switching power between different parts of an electrical system, such as between main power source and backup power source, power relays can be used.
• Power factor correction: Power relays are used to correct the power factor in electrical systems, which helps to improve the efficiency of the system.
• Uninterruptible power supplies (UPS): Power relays are used in UPS systems to switch between different power sources, such as between a battery backup and a main power source.
• Security systems: Security systems use power relays to control the operation of various devices, such as door locks, alarms, and cameras.

These are just a few examples of the many applications where power relays are used. Power relays are essential components in many electrical systems and are critical for ensuring the safe and efficient operation of these systems.

Order & Delivery Information for Purchasing Power Relays from RS

RS takes pride in being a trusted supplier and distributor of a diverse range of power relays for various applications. Take a look through our catalogue featuring renowned brands such as Finder, Schneider Electric, RS PRO, and TE Connectivity. Filter through our extensive selection and click on the product you wish to purchase.

We offer fast delivery of power relays islandwide. Visit our Delivery Page for more information on our delivery terms and fees.