Disconnect all main power sources before working on terminal connections.
Phase sequence error detected. Incorrect rotation direction across incoming lines. Measured line voltage exceeds safe operating limits. Undervoltage
Approximately 79 x 23 x 79 mm; weight is about 150g. Protection Features gmr-32b phase controller manual
The (also recognized as the COCIS GMR-32B phase sequence relay) is a specialized three-phase power supply protection device engineered to defend industrial motors, pumps, escalators, and HVAC compressors from catastrophic electrical faults. Operating primarily across standard industrial environments—ranging up to 380VAC/460VAC at 50/60Hz—this micro-controlled electronic device monitors voltage stability and phase balance in real-time. Utilizing a standard 35 mm DIN rail profile, it offers plug-and-play fault detection that stops equipment startup or triggers controlled shutdowns when volatile grid errors occur.
Guards against overvoltage and undervoltage. Disconnect all main power sources before working on
Prevents motor rotation in the wrong direction. Phase Loss: Detects dynamic or static phase failure.
If a phase is lost or voltage is too high/low, the device will immediately open the control contact to protect the load. 5. Troubleshooting the GMR-32B Phase Protector Measured line voltage exceeds safe operating limits
The (often branded under COCIS or Jiefeng ) is a three-phase power supply protection relay designed to safeguard industrial equipment like motors, air compressors, and elevators from electrical faults. Key Functions & Protection Features
