Useful Insights On Power Contactor
A power contactor is an electrical switching device designed to manage and control the flow of electricity in high-power applications. Power contactors can handle high voltage and high current applications and are available in various sizes and configurations to suit different equipment types and installations. Here we will share some of useful insights on power contractors:
1. The primary purpose of a power contactor is to switch on and off the power supply to a load using an electromagnetic coil. This coil is energized by a control circuit, which enables the contacts of the contactor to open or close, thereby regulating the power flow to the load.
2. Contactors operate on a similar mechanism to that used in electromechanical relays, but contactors can handle far higher currents than relays. Unlike relays, which are not suitable for use in circuits that exceed 20 amperes, contactors are designed with a variety of ratings and configurations and some can handle up to 12500A.
3. To test a power contactor, use an ohmmeter or multimeter. If the resistance measured between input and output terminals is zero ohms, it means that contacts are “closed”. If infinite readings are obtained, it indicates they're “opened”.
4. Some common applications of power contactors include:
- Power contactors are used in various industrial machinery to control the flow of electricity. For instance, they are used in cranes to control the lifting and lowering of heavy loads.
- Automated manufacturing lines and other systems require the coordination of multiple machines, which must be controlled and synchronized in order to achieve a desired production outcome. Power contactors switch on and off the power supply to these machines at specified times.
- The compressor is a key part of an HVAC system: it compresses refrigerant gas, which circulates through the system to cool or heat indoor spaces. Because it requires a large amount of electricity to operate, the compressor motor must be properly controlled in order to prevent damage and ensure that the entire system operates efficiently. Power contactors are used to switch the power supply on and off to a compressor based on signals from a thermostat or other control device.
- Contactors are used to switch the power in street, commercial, and residential lighting systems. Timer-controlled light switches use contactors as well—as do latch-type contactor devices.
- Power contactors are used to control the power supply to electric motors, such as pumps.
