Re: VMM (voltage monitoring module)

Home Electrical Engineering Forum General Discussion VMM (voltage monitoring module) Re: VMM (voltage monitoring module)


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.