Why do we need to test circuit breakers? It is very important to test circuit breakers regularly. Contact Timing Tests and Motion tests are performed to determine the optimal performance of the breakers. The testing can determine improper breaker operations in case of system fault and to improve system reliability. Contact Timing Tests Contact timing tests are performed to compare the breakers’ main & resistor contact performance against the manufactures specifications. The breakers OPEN, CLOSE, OPEN-CLOSE, CLOSE-OPEN & OPEN-CLOSE-OPEN operations are timed in milliseconds (ms) and cycles and then compared with the manufacturers’ specification to determine the performance of the circuit breaker. CIBRE-L6B BLUE features with a 4.3-inch large colour touch display, which is visible under both bright sunlight as [...]