SIRIUS S0 power contactor — 3RT1023-1AP04-ZX95
The Siemens 3RT1023-1AP04-ZX95 is a SIRIUS-brand power contactor in size S0, built for switching motor loads in control panels. It carries three normally-open main contacts and a 230 V 50 Hz coil, with screw-type terminals on both main and auxiliary circuits. The 45 mm width and snap-on mounting to 35 mm DIN rail (DIN EN 50022) make it a direct fit for standard panel layouts — no adapter plates needed. Rated operational current at AC-2 duty at 400 V is 4 kW; at AC-4 at 400 V it handles 8.5 A. The mechanical life is rated at 10,000,000 operating cycles, which suits frequent-switching applications like conveyors or pump controls. Pollution degree 3 means it's rated for industrial environments with conductive contamination — no extra conformal coating required for most panel builds.
Mounting and integration
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is permitted, with a required 6 mm clearance at the side for heat dissipation. Front face carries IP20 protection — safe for finger contact in an enclosed panel; the terminal area is rated IP00, so live parts are exposed during wiring. Operating temperature range is -25 to +60 °C, with a maximum installation altitude of 2000 m. Wire capacity on the main circuit: solid conductors accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²). Stranded conductors: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), 1x 8. For type 1 coordination, use a 63 A gL/gG fuse; for type 2, a 25 A gL/gG fuse is required.