What it is and what it does
The Siemens SIRIUS 3RT2015-2AK64-3MA0 is a Size S00 power contactor built for switching motor loads and resistive circuits in industrial control panels. It snaps onto a 35 mm DIN rail per DIN EN 60715 — no tools for the rail mount, but the spring-type terminals on the coil need a screwdriver for the wire. Rated for 24 V DC coils, it pulls 6 A at 24 V rated value, so it'll handle smaller contactors, relays, and PLC outputs in the same cabinet. The contactor body is 45 mm wide and 121 mm deep, leaving room for auxiliary contact blocks on the side (no auxiliary switch fitted as shipped). Mounting position is flexible — you can rotate it ±180° on a vertical surface, or tilt it forward/backward ±22.5°. That helps when you're shoehorning it into a crowded panel or a retrofit where the old footprint doesn't align.
Terminals and wiring
The coil magnet uses spring-type terminals — push the wire in, no screw tightening. The main power circuit accepts solid or stranded wire from 0.5 to 4 mm², and you can double up two conductors per terminal (2x 0.5–4 mm²). That's handy for daisy-chaining or paralleling feeds without extra junction blocks. Strip length? Standard 10 mm for spring clamps — keep it consistent to avoid whiskers.
Clearances and environment
Keep at least 10 mm clearance upwards, forwards, and downwards, and 6 mm at the sides for airflow and arc containment. The arcing time runs 10–15 ms at AC, so those gaps are real — don't crowd it against a plastic duct. Operating temperature range is -25 to +60 °C; storage from -55 to +80 °C. That covers most indoor panel environments, even unheated warehouses.
Switching frequencies and ratings
Mechanical life is typical 30 million operations — the spring terminals and the S00 frame handle that duty cycle well. Maximum switching rates: 1000 cycles/hour at AC-1 (resistive), 750 at AC-2 and AC-3, 250 at AC-4 (heavy inrush). If you're cycling a motor start every few seconds, stay under the AC-3 rate of 750/h. The contactor also carries a 0.75 hp rating at 230 V, and switching currents at various voltages: 6 A at 24 V, 3 A at 400 V, 0.3 A at 220 V, etc.