What is the overcurrent relay?

Overcrurrate relay is an electrical protective device designed to interrupt the power into the circuit, appliance or machine in case of overload or failure. These devices usually consist of a manual circuit breaker or contactor and the current sensing relay that closes with it. If the device or circuit is damaged or overloaded, it will begin to draw a current exceeding its normal operating parameters. This causes the current sensing relay to stumble or deactivate the contactor and trim the power supply. Since many machines draw a very high current when starting, most of the overcurrent relay has a built -in "delay" function that accommodates high current for the preset period before activation. If it is left uncontrollable, it will cause further damage and possible destruction of the machine. Tom can also cause explosion or fire and represent a serious risk of electricity for operators. One of the most effective ways to prevent this is the overcurrent relay in the primary power circuit. ItThe device is designed to connect with a circuit breaker or contactor, thus reducing the power supply if the excessive current is reduced.

This relay can be separate units or integral parts of the primary switching devices they work with. Some functions settings, while others have a user -adjustable range of current settings. Separate relays may have removable sensing current coils on each phase or line that can be confused with units of various current assessments. In the case of a circuit breaker protected by the overcurrent diameter protected relay requires a trip to switch back when the power is restored. The relay contactors generally reduce the power -active coil power in the event of a overcurrent situation and must be reset before the machine or device can be restarted.

Many overcurrent relay variants include elements of delay that allow excessive proUD for a predetermined time before burning energy. This function is designed to suit machines with high starting current rating. The delay setting allows you to run the machine and its current drain will return to normal without activating the relay. When the rewritten relay makes a trip, it is always advisable to explore the cause before resetting the system and restarting to prevent possible damage or injury to the operator.