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Power Relays, over 2 Amps

Power relays are switches that direct electrical current from one source to another. This type of relay is used with currents over 2 amps and is often controlled by motors, control systems or by a simple switch. In the following article we discuss the common application fields and working principles of this kind of power relay.

Types of Power Relays

Power relays can be divided into two types. The first type of relay is an AC relay which is designed to handle up to sixteen AC voltage. It can be used for very low level AC voltages and can be used to reverse AC polarities, thus protecting a circuit from reverse polarity currents. The second type is a DC relay designed to handle up to forty two volts DC.

Application Fields

Power relays are used in many different industries, including automotive, building automation systems, control systems, electric motors, energy management, lighting control, medical industries, robotics, and sensor control. They are specifically used in cars, boats, houses and factories for providing reliable switching of electrical current.

Working Principle

The working principle of a power relay is based on electromagnetism. As electrical current flows through the coil it creates a magnetic field which is used to move the contact points to the connected position allowing the current to flow through. When the flow of electric current is cut off, the contact points move back to their start position, thus cutting off the current.

Safety Features

Power relays are designed for safer operation. When used in automotive applications, these power relays are designed to recover from short circuit conditions. They also have failsafe features such as lock-out/relays which prevent mis-operation and over temperature protection which disconnects the circuits when the temperature reaches a certain level. These safety features ensure that the power relay will perform its function correctly and will not cause any damage to the connected devices.

Conclusion

The power relay has become an invaluable component in many industries. It is used to switch electrical current from one source to another and is commonly used in cars, boats, houses and factories. The power relay is also designed with safety features to protect from short circuits and over temperature conditions. In summary, the power relay is a fundamental component used in countless applications across the globe.

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