Our Procedure for Rebuilt Circuit Breakers
Medium Voltage Circuit Breaker Rated 5KV, 7.2KV or 15KV
All circuit breakers are completely rebuilt and tested in accordance with the following procedure:
- Complete disassembly of used circuit breaker
- Inspection of each part for physical integrity per manufacturer's specifications
- Worn parts replaced
- Close inspection of the operation of the circuit breaker's main arcing contacts to insure that all springs responsible for maintaining primary contact pressure are in good condition
- Base painted
- All electrical parts repainted, replaced and/or reinsulated as required
- Arc chutes inspected
- All wiring inspected and replaced if needed (based on original wiring diagram)
- Fully lubricate breaker
- The circuit breaker is reassembled, according to manufacturer's specifications
Electric Tests to Include:
- Measure contact resistance
- Perform minimum pickup voltage tests on trip and close coils
- Perform insulation resistance tests; pole to pole, pole to ground and across open pole
- If charging motors are used, check condition of brushes and limit switches
- Perform over-potential test, or power factor test with breaker in open and closed position. Includes (optional) testing of all arc chutes for watts loss
- All rebuilt breakers will be returned in equal to new condition with a 2- year guarantee
Low Voltage Air Circuit Breakers Rated 240VAC, 480VAC or 600VAC
All circuit breakers are completely rebuilt and tested in accordance with the following procedure:
- Complete disassembly of breaker
- Each part inspected for physical integrity per manufacturers specifications
- Worn part(s) replaced
- Pitted contacts repaired or replaced
- Base Painted
- All parts replaced, reinstalled and/or repainted as required
- Trip units removed, inspected, dashpots cleaned and refilled with proper oil
- Electrically operated breakers, wiring to be inspected
- Fully lubricate breaker
- Breaker to be reassembled per manufacturers specifications
Electric Test to Include:
- Contact resistance test
- Insulation test performed: pole to ground, pole
- Long time-delay determined by primary injection at 300% pickup current
- Short time-delay determined by primary injection
- Instantaneous pick up current determined by primary injection. All primary injection tests adhere to the manufacturers original specifications
- Trip unit reset will be verified
- If charging motors are used, check condition of brushes and limit switches
All worn parts to be replaced; broken or missing parts to be replaced. All breaker rebuilt as supplied will be in equal to new condition with a one year guarantee.