Fire protection switch (arc fault protection device) with residual current circuit breaker/circuit breaker combination, complies with IEC-EN62606, reliable detection of arc faults, residual current part independent of mains voltage, optionally pulse current sensitive, delayed or undelayed, contact position indicator red-green, tripped indicator with LED clamping aid - rear plug protection, tristable locking slide - enables removal from an existing busbar assembly, extensive range of accessories can be retrofitted, rated residual currents: 10mA or 30mA, rated currents up to 40A, tripping characteristics B,C, rated switching capacity up to 10kA, suitable for use outdoors (construction site power and outdoor distributors) down to -25°C