What it is and what it does
The Siemens SIRIUS 3RT1017-1AU01 is a size S00 power contactor rated for switching motor loads and resistive circuits. It carries a 24 VDC coil and is rated 10 A at 24 V, with a mechanical life of 30,000,000 operations typical. The screw-type terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, up to 2x (0.75 to 4 mm²) max. Pollution degree 3 means it handles industrial environments with conductive dust or condensation — no extra conformal coating needed for most panels.
Mounting and integration
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. The 45 mm width and 72 mm depth fit a standard 8-module wide DIN rail section with room for a terminal block next to it. Side-by-side mounting is allowed — no mandatory gap between contactors — but keep the 6 mm side clearance to adjacent metal enclosures for heat dissipation. Front and terminal protection is IP20, so it's safe for open-panel use but not washdown areas.
Coordination and protection
For type 2 coordination (no damage to the contactor under short circuit), use a gL/gG fuse rated 20 A. For type 1 coordination (contactor may be damaged but no fire risk), a 35 A gL/gG fuse is acceptable. The AC-2 rating at 400 V is 5.5 kW, and the AC-4 rating at 400 V is 8.5 A — these are the motor-switching and plugging/jogging duty limits, respectively. The coil draws at 24 VDC; verify the control transformer or power supply can handle the inrush.