No-volt release switch for workshop machinery: it drops out when the supply fails and will not close again on its own, so the machine cannot restart by itself when power comes back. Double-pole isolation at 16 A, 230 V nominal. Snap-in mount to a 45.2 x 21.7 mm cut-out, aluminium housing, quick-connect terminals. IP40 as supplied, IP54 at the front with the cap fitted. Built to DIN/VDE 0660 part 102 and IEC 947-4-2. Eichhoff 3251-00.01, RS stock number 398-5178.