The Restart PRO Autotest Residual Current Circuit Breaker (RCCB) performs an automatic self-test at regular intervals, replacing the need for manual testing. During this test, the residual current circuit breaker is fully activated without interrupting the power supply to the system. If the RCCB trips, Restart PRO Autotest restores the power supply after conducting an insulation test of the system. In the case of a persistent system fault, no attempt to reset will be made. Restart PRO Autotest conducts a system check every 2 minutes. If the system returns to a safe state, Restart PRO Autotest will switch the RCCB back on. It will not switch on if a fault is still present. LEDs and an auxiliary contact indicate the operating states. Restart PRO Autotest can be easily turned on or off using a simple toggle switch. Connection (max): 35 sqmm with insulated plug-in protection, top feeding. Compatible with the BUS module.