Lexicon DIY-Knowledge

Earth-leakage circuit-breaker (e.l.c.b.), residual-current-operated circuit breaker (r.c.c.b)

FI-Schutzschalter, Fehlerstromschutzschalter

Interruptores de seguridad FI

Disjoncteur de protection FI

Switch which disconnects the circuit by electro-mechanical means if, for exmple, an insulation defect makes a fault current flow through the tool operator.

The fault current or leakage current is detected by a comparative measurement of the forward and reverse current in the power consumer. If the reverse current is not equivalent to the forward current, the earth-leakage circuit breaker is activated. This happens so quickly that the operator is adequately protected.