R-ProField casesRefrigeration 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

Field tip

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