Control changeover switch with imprint 'Heating emergency switch' AP W.1 gray. Control changeover switch with imprint - Heating emergency switch - with lens AP, off/changeover, IP55. For control circuit, with blue LED unit 230 V for switch/button, with N terminal, with plug-in terminals, with an entry for 2 cables and an entry for cable or pipe, full-surface seal under the housing base to seal the rear of the housing, easily accessible, funnel-shaped mounting holes in the housing, a Wago 2-wire connection terminal included for wiring, two snap-in locations for Wago 2-wire connection terminals in the housing base, plenty of space for wiring under the bases of the inserts (hollow floor), easy installation of the insert in the housing by snapping it into place, secure fixing of the frame to the housing via bayonet quick-release fastener. Not suitable for heating systems > 50 kW. Housing screws made of stainless steel. Surface-mounted installation. Material: plastic, thermoplastic, impact-resistant.