Restart is a revolutionary circuit with automatic reset allows you to permanently remove the hardship caused by the inappropriate or untimely manner release of the guard. Switches mounted in the center differential can be subject to interventions manner not necessarily related to a malfunction but to the unpredictable events such as lightning, temporary overloads or transient disturbances in the network. Inappropriate intervention may cause the switch differential inconvenience all the more serious the longer the suspension of energy: for example, the thawing of the freezer, decommissioning dell'antifurto, the loss of programming of the heating or irrigation, detention of an aquarium pump or out of service for UPS systems. When the differential locks, restart occurs first of all that the event which caused the intervention is not due to a failure of persistent or dangerous: if everything is in place, it reactivates the switch itself, restoring the voltage within 90 seconds. Restart RD + RD pure RCD - 2 poles 25A type A idn = 0.03 A 230V - 4 modules.