(also known as the COCIS or Ubersweet GMR-32B) is a three-phase power supply monitor relay designed to protect industrial equipment like motors, pumps, and central air conditioning compressors from electrical faults. It monitors for phase loss, reverse phase (incorrect sequence), over-voltage, and under-voltage. Technical Specifications According to documentation from retailers like MUNEFE on Amazon AliExpress typically includes the following specs: Rated Voltage:
*The 690VAC rating is specifically for the GMR-32B+N series designed for 4-wire systems with Neutral protection. gmr32b phase controller manual
: Use a digital multimeter to verify that full line voltage is reaching terminals R, S, and T. (also known as the COCIS or Ubersweet GMR-32B)
Connect the three-phase power lines here. The sequence matters for phase reversal detection. reverse phase (incorrect sequence)