Thermal cycling (heating and cooling) can loosen screw terminals over time.
Excessive heat in a phase monitoring relay is rarely "normal" and usually indicates one of the following: GMR-32B Phase controller, 300-400V 50/60HZ - JIEFENG
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These are usually "Dry Contacts" (NO/NC). Wire the Normally Open (NO) contact in series with your motor starter's contactor coil.
: Often indicates an incorrect phase sequence. Troubleshooting and Maintenance Thermal cycling (heating and cooling) can loosen screw
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Check that all three phases are actually present using a multimeter. The GMR-32B requires all three to function. Wire the Normally Open (NO) contact in series
If your GMR32B Phase Controller is running "hot" to the touch or triggering thermal overloads, this indicates an issue with installation, load matching, or ventilation.