SIRIUS Size S00 power contactor — 24 VAC coil, screw terminals
The Siemens 3RT1015-1AB02-ZX95 is a SIRIUS-brand power contactor in the Size S00 frame, built for switching motor loads in control panels. The 24 VAC coil (rated at 50/60 Hz) pulls in across 0.8 to 1.1 times rated voltage at 50 Hz and 0.85 to 1.1 at 60 Hz, so it holds in through typical line sags without drop-out. Screw-type terminals on the main circuit accept up to 2x 4 mm² stranded or 1x 12 AWG, matching the wiring common on 4 kW (690 V) or 3.5 kW (500 V) motor circuits. Mounting is screw or snap-on onto 35 mm DIN rail per EN 50022 — a standard panel integration step.
Motor duty and coordination — AC-2, AC-4, and short-circuit ratings
For motor switching, the AC-2 rating at 400 V is 3 kW, covering wound-rotor or slip-ring motor duty where the contactor makes and breaks at reduced current. The AC-4 rating at 400 V is 6.5 A — this is the inching/plugging duty cycle, which is the tougher thermal test because the contactor interrupts full locked-rotor current. For short-circuit coordination, Type 2 (no damage to the contactor or starter) requires a 20 A gL/gG fuse; Type 1 (contactor may need replacement) allows a 35 A fuse. That 20 A limit tells you the panel designer should size the upstream protection for selectivity with downstream motor loads, not just the contactor's thermal rating.
Auxiliary contact ratings and wiring
The contactor carries a built-in auxiliary contact block rated for 10 A at 24 V (AC-12 resistive), 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC. That DC rating is the one to watch — if you're switching a DC control circuit (e.g., a PLC output or a relay coil), the 220 V DC figure of 0.3 A is the limit; exceeding it welds the contacts. The auxiliary wiring accepts the same screw-terminal range as the main circuit: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or max 2x 0.75 to 4 mm² solid/stranded.