Series button, 2 normally open contacts with separate input terminals AP W.1 gray. Series switch, 2 changeover contacts AP, separate input terminals, IP55, with plug-in terminals, with one entry for 2 cables and one 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 for wiring included, 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 base), 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, housing screws made of stainless steel. Surface-mounted installation. Material: plastic, thermoplastic, impact-resistant.