ACB (Air Circuit Breaker) testing and service are essential for ensuring the safety and reliability of electrical systems. A typical service protocol begins with a thorough visual inspection to check for physical damage, signs of overheating, or contamination. Technicians then perform cleaning to remove dust and debris from the breaker's frame, arc chutes, and contact surfaces. A key step is lubrication of the moving parts to ensure smooth mechanical operation. The service includes crucial electrical testing, such as insulation resistance tests and contact resistance tests, to verify the integrity of the circuits. Finally, functional testing of the trip unit is conducted to confirm the breaker will trip correctly under fault conditions. This comprehensive process, performed by experienced professionals, ensures the ACB operates reliably, preventing costly downtime and protecting downstream equipment.