The Restart PRO Autotest residual current circuit-breaker RCCB carries out an automatic self-test Autotest at regular intervals, which replaces the manual actuation of the test button. During this test, the residual current circuit-breaker is operated completely without interrupting the power supply to the system. If the residual current circuit breaker trips, Restart Pro Autotest restores the power supply after an insulation test of the system. In the event of a continuous system fault, no switch-on attempt is made. A system check is carried out by RESTART PRO Autotest every minute. If the system assumes a safe value, RESTART PRO Autotest switches the RCD on again. It does not switch on in response to an existing fault. LEDs and an auxiliary contact signalise the operating status. RESTART PRO Autotest can be switched on or off by a simple switching slide.connection max: 35qmm with insulated plug-in protection, top feed. Compatible with BUSWiFi module. GW90923B.