R-Pro › Field cases › Refrigeration systems
Circuit breaker keeps tripping
Likely causes
Excessive compressor inrush current (defective start capacitor)
Check: Identify breaker type (overcurrent trip vs. ground fault trip)
What to do: Identify breaker type (overcurrent trip vs. ground fault trip) → Isolate loads individually and test to pinpoint faulty load → Measure compressor winding insulation resistance to ground (≥1MΩ) → Measure inrush current and check capacitor capacity → Verify circuit breaker rated capacity is appropriate
Ground fault (damaged wiring insulation, compressor winding ground)
Check: Isolate loads individually and test to pinpoint faulty load
What to do: Isolate loads individually and test to pinpoint faulty load → Measure compressor winding insulation resistance to ground (≥1MΩ) → Measure inrush current and check capacitor capacity → Verify circuit breaker rated capacity is appropriate
Undersized or aged circuit breaker
Check: Measure compressor winding insulation resistance to ground (≥1MΩ)
What to do: Measure compressor winding insulation resistance to ground (≥1MΩ) → Measure inrush current and check capacitor capacity → Verify circuit breaker rated capacity is appropriate
Overload (refrigerant overcharge, high condensing pressure)
Check: Measure inrush current and check capacitor capacity
What to do: Measure inrush current and check capacitor capacity → Verify circuit breaker rated capacity is appropriate
Insulation resistance measurement is mandatory when an ELCB trips
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →Related cases
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