Is the Schneider GV2-RS21 motor circuit breaker tripping erroneously?
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The GV2-RS21 motor circuit breaker used in the on-site cooler has experienced two abnormal shutdowns recently; in both cases, it was the GV2-RS21 circuit breaker that tripped, resulting in the shutdown of the water pump motor. Brief description of the situation: The motor has a power of 4.0 kV and a rated current of 8.1 A. A GV2 circuit breaker is used as the main circuit breaker, with a setting of 19 A. A thermal relay is installed downstream of the contactor for overload protection. When GV2 is in operation, the motor is functioning normally; there is no pump reversal or stall, and the thermal relay has not activated. The motor’s grounding has been checked and its resistance is normal. The operating current is 8.0 A, and no issues were observed after one day of operation. I was completely puzzled; when I tried to explain to the company that the motor’s long-term operation had caused the bimetallic strip to deform, leading to the malfunction, even I couldn’t convince myself with that explanation. There are so many high-level math problems on Haiyou – have you seen this phenomenon before? Are there other factors causing the action?
I agree with your view; it must be a malfunction of the air switch. The motor cable is intact, and the thermal relay in the main electrical circuit is not activating. It’s likely that the thermal trip function of the air switch is malfunctioning. Replace the switch
Check whether the terminals of GV2 are loose or overheating, which could cause malfunction
The circuit breaker can be set again. Larger
Is the circuit breaker of the thermomagnetic type? Is the operating environment of the components relatively hot? Are there any signs of overheating in the power distribution lines?