SIRIUS S0 power contactor for motor and resistive loads
The Siemens SIRIUS 3RT1023-1AP00-ZW97 is a size S0 power contactor with three normally open main contacts, designed for switching motor loads in control panels. It mounts on a 35 mm DIN rail per DIN EN 50022, using either screw fixing or snap-on, and occupies a 45 mm width — a standard slot in the SIRIUS modular system.
Motor switching capability and coordination
For AC-2 duty (slip-ring motors, moderate inrush) at 400 V, the contactor is rated for 4 kW. At AC-4 (plugging, inching, reversing) at 400 V, it handles 8.5 A — this is the rating that governs frequent jogging or reversing applications. For standard squirrel-cage motors, the maximum motor power is 4.5 kW at 500 V and 5.5 kW at 690 V. Type 2 coordination (minimal contactor damage under short circuit) requires a gL/gG fuse rated 25 A. Type 1 coordination (contactor may need replacement) allows a 63 A fuse. The main circuit uses screw-type terminals accepting 2x 1 to 2.5 mm², 2x 2.5 to 6 mm², or a single 10 mm² conductor.
Auxiliary contact ratings and environmental limits
The integrated auxiliary contacts (likely 1 NO + 1 NC, though not explicitly counted in the main contact spec) carry 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — sufficient for pilot duty on PLC inputs or small relay coils. Mechanical life is 10 million cycles, typical for the S0 frame. Operating temperature range is -25 to +60 °C, with pollution degree 3 (conductive pollution, typical for industrial enclosures). The front face is IP20; the terminals are IP00, meaning the terminal area must be inside a cabinet. Maximum operating altitude is 2 000 m without derating.
Panel integration and mounting
Side-by-side mounting is permitted with zero lateral clearance, so you can pack multiple S0 contactors on a DIN rail without spacing. The 45 mm width per unit means a 12-module rail section holds 12 contactors. Depth is 91 mm, height 85 mm — check gland-plate clearance if the rail is near the back wall. The auxiliary contact wiring accepts 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or a single 4 mm² conductor — solid or stranded. The reference code per DIN EN 81346-2 is Q, which aligns with standard power circuit labelling in European panel schematics.