Siemens SIRIUS 3RT1015-2HB42 — 24 V DC Power Contactor, Size S00
The Siemens 3RT1015-2HB42 is a SIRIUS power contactor in the compact Size S00 frame, built for switching motor and resistive loads in control panels. It carries a 24 V DC coil with a holding power of 2.3 W, and its spring-loaded terminals accept 2x (0.25... 2.5 mm²) solid or stranded wire — no ferrule crimping needed for the main circuit. The contactor mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, occupying a 45 mm width on the rail. Rated for AC-2 duty at 3 kW / 400 V, this contactor handles slip-ring motor switching where the load current stays below make/break stress. The DC switching side is rated 10 A at 24 V (AC-12), covering resistive and light inductive loads in the control circuit. For AC-4 plugging/inching duty at 400 V, the contactor is rated 6.5 A — a figure to respect when the application involves frequent reversing or jogging.
Panel Integration and Wiring
At 45 mm wide and 73 mm deep, the 3RT1015-2HB42 fits standard 35 mm DIN rail with side-by-side mounting permitted — no mandatory gap between units. The spring-loaded terminals for the main current circuit accept 2x (0.25... 2.5 mm²) or 2x (24... 14 AWG) conductors; the control circuit uses the same terminal type. IP20 finger-safe protection on the front and terminals means the contactor can sit exposed inside an IP54 enclosure without additional shrouding. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2 000 m. The contactor is rated for pollution degree 3, so it tolerates conductive dust and condensation typical in industrial environments without conformal coating.
Coordination and Protection
For Type 2 coordination (no damage to the contactor after a short circuit), Siemens specifies a gL/gG fuse rated 20 A upstream. For Type 1 coordination (contactor may need replacement after a fault), the fuse rating is 35 A gL/gG. These values govern the short-circuit protection sizing in the panel design.