The Siemens 3RT2017-2HB42 is a SIRIUS coupling contactor in the size S00 frame. It's a 24 V DC coil unit with spring-type terminals on the magnet coil, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The contactor is rated for 10 A at 24 V and carries a typical mechanical life of 30,000,000 operations. Maximum switching frequency is 1,000 cycles per hour under AC-1 duty and 750 cycles per hour under AC-3 duty.
What the ratings mean for fit
The 24 V DC coil is the critical selection parameter here — this contactor will not pull in on 24 V AC or higher DC voltages. The spring-type terminals accept solid or stranded wire from 0.5 to 4 mm², which covers most control wiring in a standard panel. Size S00 is the smallest SIRIUS contactor frame, so it fits where panel space is tight — 45 mm wide, 70 mm tall, 73 mm deep. The mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward and backward. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. Clearance requirements: 10 mm upwards, downwards, and forwards; 6 mm at the sides.
Sourcing and lifecycle
No auxiliary switch is included with this base unit — if you need auxiliary contacts, they must be ordered separately and snapped onto the side of the contactor.