Home › Electrical Engineering Forum › General Discussion › VMM (voltage monitoring module) › Re: VMM (voltage monitoring module)
2011/07/01 at 1:33 pm #12249
This device is a special relay that will signal or disconnect a more expensive circuit if it detects a problem with the voltage feed. Some of them will monitor three phase voltage for dips or overshoot (variations greater than 10% of nominal typically). It may also monitor loss of a phase or phase reversal. It is a level of protection above that of a fuse or circuit breaker.