FI circuit breaker as a mains voltage-independent residual current circuit breaker (RCCB) EN61008-1. Suitable for the subsequent installation of 2 additional devices and/or combinations with modules for automatic restart. The switching lever can be sealed in the switched-on and off state or can be locked with a lever lock (order accessories separately) for a padlock. With integrated residual current display and fold-down label plate. Connection (max): 35 mm² with insulated plug-in protection. The connection screws can be provided with a sealable cover (order accessories separately).