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What is the maintenance to be carried out following Short-Circuit Trip?

A circuit breaker is tested in severe conditions in accordance with standard IEC 60947-2, to check that it can break a short-circuit current at maximum permissible value 3 times.
After a short-circuit fault, it is necessary to:

 Carefully clean off any traces of black smoke (the particles may be conducting)
 Check the power connections and fine wires
 Operate the circuit breaker several times at no load (at least 5 times)

Cleaning the Circuit Breakers
To avoid dust deposits that can affect the circuit breaker mechanical operation, it is recommended that the circuit breakers be cleaned if necessary when maintenance is carried out.
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