I am having a problem I was hoping someone could help with. Will a three phase molded case circuit breaker trip on the loss of a phase? I have a 480V three phase circuit breaker that keeps tripping and I cannot figure out why. I have an electronic relay monitoring the 480V circuit that indicates there is a phase loss when the breaker is tripping. (Please note that the relay cannot trip the breaker, the breaker only trips as a result of what is on the 480V line.) The 480V breaker is feeding a starter which is going out and powering a transformer connected to a DC rectifier. The 480V breaker is a 30A rated breaker. It will run fine for an hour or so and then trip througout the day.
Since I dont know what is causing the breaker to trip my questions are these. Will a phase loss cause a 3 phase breaker to trip. What happens to the voltage and current on the other two phases if the feed was to loose one of the phases. Normally the current on all three phases is about 4.5A. If the feed lost one of the phases would that cause the current on the other two phases to increase thus tripping the breaker? Will the voltage on the other two phases still be 480V line-line. What happens during a phase loss?
Can anyone help?
Mull982
Since I dont know what is causing the breaker to trip my questions are these. Will a phase loss cause a 3 phase breaker to trip. What happens to the voltage and current on the other two phases if the feed was to loose one of the phases. Normally the current on all three phases is about 4.5A. If the feed lost one of the phases would that cause the current on the other two phases to increase thus tripping the breaker? Will the voltage on the other two phases still be 480V line-line. What happens during a phase loss?
Can anyone help?
Mull982