This ACB maintenance checklist helps technicians inspect and service air circuit breakers. Capture circuit designation, manufacturer and model, serial number, current rating, breaker type, number of poles, and any accessories. Record protection relay details and year of manufacture. Perform a thorough visual inspection, checking rear connectors, arc chute condition, breaker casing, internal mechanism cleanliness, and any signs of heat or arcing. Verify breaker alignment in the chassis and control cabling to auxiliaries. Conduct electrical tests including insulation resistance with test voltage and readings across L1-L2, L1-L3, and L2-L3, plus contact resistance (ductor) tests for L1, L2, and L3, noting tester used and parameters. Use this template to standardize ACB maintenance and document results for safety and compliance.
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