A contactor is an electrical device that switches an electrical circuit on and off. It is typically used to control motors and other high-current devices. However, contactors alone are insufficient for all applications, and additional accessories are required. Contactor accessories are devices that are added to contactors to enhance functionality and reliability.
Overload Relays:
An overload relay is a device connected in series with a contactor to protect motors and other high-current devices from overloading. Overload relays sense the current passing through a circuit and disconnect the circuit when the current exceeds the rated value. They are essential in preventing motor damage and reducing the likelihood of electrical fires.
Auxiliary Contacts:
Auxiliary contacts are additional contacts added to contactors to provide additional control signals. They are used to monitor the state of the contactor, provide feedback to other devices, and interlock with other control circuits. Auxiliary contacts can be either normally open or closed and are available in various configurations.
Coil Suppressors:
Coil suppressors are devices added to contactors to reduce electrical noise and protect the contactor from voltage spikes. They are essential in preventing damage to the contactor and other devices in the circuit. Coil suppressors come in various types, including capacitors, resistors, and diodes, and are chosen based on the application's specific requirements.
Interlocking Devices:
Interlocking devices are devices added to contactors to prevent the simultaneous operation of two contactors or to ensure that one contactor is turned off before the other is turned on. They are used to improve the circuit's safety and reliability and prevent damage to the contactors and other devices.
Contactor accessories are essential in improving the functionality and reliability of contactors. They protect motors, provide additional control signals, reduce electrical noise, and improve safety. Understanding the different types of contactor accessories and their applications is critical in designing and implementing reliable electrical circuits.
