Signal contact/auxiliary switch (switchable) for RCCB F204 125 A, F200 B 80-125 A and F200 B+ (blue switch knob on the left), function: display of the switching position of the residual current circuit breaker (RCCBs) or display in the event of a fault that the residual current circuit breaker has tripped due to a fault current against earth (switchable). Suitable for RCCB series F200 125A, F200 B 80-125 A and F200 B+ (blue switch knob on the left).