Medium Voltage Air Circuit Breaker Recondition Guidelines

1. Inspect breaker for rust, corrosion, signs of overheating, cracks or missing parts. Check contacts for excessive deterioration, cracks, chips or pitting. Verify interlocks are present and in proper position.
2. Disassemble breaker to smallest assembly (within reason – certain mechanism parts were not meant to be taken apart).
3. Replace all missing hardware, paint frame including racking hardware as per manufacturer’s specifications.
4. Clean operating mechanism, replate or repaint mechanism parts as needed as per manufacturer’s specifications. Reassemble operating mechanism.
5. Clean or degrease primary and secondary disconnects, silver plate primary disconnects and contacts as per manufacturers specifications.
6. Lubricate operating mechanism, drawout mechanism and primary disconnect stabs.
7. Check main and arcing contacts for proper wipe, pressure, gap or other manufacturer’s recommendations.
8. Disassemble and clean arc chutes, insulate with clear coat insulation if specified.
9. Replace all control wiring to customer’s specified wiring diagram (some wiring harnesses are reconditioned intact as their pins can not be easily redrilled).
10. Replace all defective, damaged or worn parts.
11. Check all connections for proper torque.
12. Check manual and electrical operation.
13. Tests: Perform meggar, ductor and operational testing of breaker.

Note: These guidelines are general and may not apply to all medium voltage breakers. Please contact our sales department if you have specific inquiries as to our recondition practices.