Method for protecting a fault-current protection device or a differential current protection device in an agressive environment and corresponding fault-current or differential current protection device

摘要

A method of protecting a fault current (FI) circuit-breaker or a difference current (DI) circuit breaker, forming together a protection device, from so-called 'sticking' at the pole faces of the associated yoke of the release or trip device (3). A heating element acting directly on the yoke (11) and/or the armature (12) is adjusted so as to heat the micro-environment above the dew-point, so that the heating device acts on the armature and/or yoke constantly over a period of time.