SIRIUS 3RT1015-1AR61 — what it is and what it does
The Siemens 3RT1015-1AR61 is a SIRIUS power contactor in size S00, designed for switching motor loads and resistive loads in industrial control panels. It mounts on a 35 mm DIN rail per EN 50022 via screw or snap-on, and uses screw-type terminals for the main current circuit. The 24 VDC coil draws the contactor in, rated for continuous duty. At AC-12 (resistive load) it handles 10 A; at AC-2 (slip-ring motor starting) it delivers 3 kW at 400 V, and at AC-4 (plugging/inching) it carries 6.5 A at 400 V. For a 3-phase motor at 400 V 50 Hz, the rated operational power is 3 kW (AC-3 duty, though not explicitly listed, the AC-2 and AC-4 figures bracket the typical motor-switching range). Operating temperature range is -25 to +60 °C, with pollution degree 3 (conductive pollution typical in industrial enclosures). The contactor is rated for installation altitudes up to 2 000 m without derating.
Panel integration and wiring
The 3RT1015-1AR61 occupies 45 mm width on the DIN rail, with a depth of 72 mm and height of 57.5 mm. Side-by-side mounting is permitted, with a minimum 6 mm clearance to adjacent devices for cooling. The screw terminals accept solid or stranded conductors: 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or max 2x (0.75–4 mm²); AWG equivalents are 2x (20–16), 2x (18–14), and 1x 12. Front and terminal protection is IP20 — suitable for enclosed panel use, not for washdown or outdoor exposure.
Coordination and protection
For type 1 coordination (no damage to contactor after short circuit, but may need replacement), the required fuse is gL/gG 35 A. For type 2 coordination (contactor remains operational after fault), use gL/gG 20 A. These ratings apply to the main circuit; the auxiliary contact is rated for 1 A at 110 V, 0.3 A at 220 V, and 2 A at 60 V. The contactor has a typical mechanical life of 30 million operations, reflecting the S00 frame's durability in high-cycle applications.