Plastic insulating surface-mounted housings - for PKZM0 motor circuit-breakers with VHI early-make auxiliary contacts with red-yellow knob for use as emergency stop switch according to EN 60204. M25 metric pre-punching on top and bottom. At the top, bottom, in the rear wall, there is a pierced membrane for power cables and control cables. The CI-K2 insulating enclosure has N and PE terminals.