Auxiliary switch on the front, 4 NO Current path 1 NO, 1 NO, 1 NO, 1 NO for contactor relays Size S00 screw terminal 53/54, 63/64, 73/74, 83/84 for 3RH2140/3RH2440 acc. to EN 50011 Physically coded; only with contactor relays 3RH2140* and 3RH2440* can be combined (according to EN 50011)