Life of an MCB

[Essexboy7]

Does anyone know how many times an MCB can trip before it is meant to be replaced?If there is any official publications on it can anyone point me to them?

Thanks in advance for any replies

 

[Knobhead]

The two functions of a MCB are sustained (thermal) and instantaneous (magnetic) overload. With this instance it would have been switching (breaking) sustained overload not fault (instantaneous) current. It would be no more onerous that switching a kettle on and off.