SIRIUS S0 power contactor — 3RT1024-1AL24-ZX95
The Siemens SIRIUS 3RT1024-1AL24-ZX95 is a size S0 power contactor rated for motor loads up to 7.5 kW at both 500 V and 690 V, with a 24 VDC coil. It mounts on a 35 mm DIN rail per EN 50022 and uses screw-type terminals for the main circuit. The front face carries IP20 protection; the terminals themselves are IP00, so panel builders should account for clearance around the wiring zone.
What the ratings mean for fit
The 7.5 kW motor rating at 500 V and 690 V tells you this contactor handles a 3-phase induction motor up to that mechanical output — typical for a moderate pump, fan, or conveyor drive on a 400/480 V or 575/600 V line. The AC-4 rating of 12.5 A at 400 V covers inching or plug-reverse duty where the contactor makes and breaks stalled-rotor current; if your application cycles the motor under load, that's the number to size against, not the AC-3 continuous rating. Operating temperature spans -25 to +60 °C, which covers most indoor panel environments including unventilated enclosures near process heat. Pollution degree 3 means it's rated for conductive dust or occasional condensation — typical for industrial control rooms, not clean dry locations.
Panel integration notes
The S0 frame measures 45 mm wide, 85 mm tall, and 140 mm deep — a compact footprint that leaves room for auxiliary contact blocks or a separate overload relay on the same DIN rail. Screw and snap-on mounting onto 35 mm rail per EN 50022; side-by-side mounting is allowed with a 6 mm gap to adjacent devices for heat dissipation. Wire range for the main circuit accepts up to 2x 10 mm² stranded or 1x 8 AWG, with a recommended fuse of 25 A gL/gG for type 2 coordination or 63 A for type 1.