Auxiliary switch and fault indication switch Acti 9 OF/SD+OF. 2 changeover contacts, operating voltage (Ue) 23-415V AC / 24-130V DC. Both the switching position and the fault triggering can be reported. One of the two changeover contacts can be selected as OF or SD before installation using the side selection switch. The setting is visible from the front. The auxiliary switch and fault indication switch OF/SD+OF complies with the following standards: IEC/EN 60947-5-1.