Medium-Voltage Circuit Breaker Maintenance

Medium-voltage circuit breakers, breakers for systems with voltages of 2.4 to 38 kV, have maintenance procedures that will vary based on construction of main contacts and mechanisms used to operate these contacts. In all cases, manufacturer’s recommendations must be known and understood by those performing this work. Tests of oil-filled medium-voltage circuit breakers are not covered in this discussion as these tests may be more elaborate than those listed below.