SIRIUS S00 power contactor — 24 VDC coil, screw terminals, DIN-rail mount
The Siemens 3RT1015-1AS02 is a SIRIUS S00-frame power contactor with a 24 VDC coil rated to pull in at 10 A, sized for switching motor loads and resistive circuits in control panels. It mounts via screw and snap-on onto a 35 mm DIN rail per EN 50022, occupying a 45 mm width that leaves room for adjacent devices in a crowded enclosure. The main current circuit uses screw-type terminals accepting 2x (0.5...1.5 mm²) solid or 2x (0.75...2.5 mm²) stranded, with a max of 2x (0.75...4 mm²) — typical for panel wiring up to 4 mm² without needing ferrules. Front and terminal protection is IP20, so it's suited for enclosed installation where accidental finger contact is the concern, not washdown environments. Operating temperature spans -25 to +60 °C, with a maximum altitude of 2 000 m — fine for most indoor industrial settings but watch the derating if you're above that elevation or near the upper temp limit in a sealed cabinet.
What the ratings mean for your BOM line
The 24 VDC coil draws its rated current at nominal voltage; the contactor holds in down to about 18 V before dropping out, so a saggy DC bus from a long cable run or shared power supply can cause chatter. The AC-1 resistive load curve goes to 10 A at 400 V, but for motor duty the AC-3 rating at 400 V is 3.5 kW — that's the number you size the overload relay against, not the 10 A headline. Side-by-side mounting is permitted, with a 6 mm clearance to adjacent devices on the side — no extra air gap needed, which keeps the rail density high. Pollution degree 3 means it's rated for conductive pollution typical in industrial panels (dust, condensation), so no conformal coating required for most environments.