Siemens SIRIUS 3RT1017-1BM41 — 24 VDC Power Contactor, Size S00
The Siemens SIRIUS 3RT1017-1BM41 is a size S00 power contactor with a 24 VDC coil, designed for motor and resistive load switching in control panels. It mounts via screw or snap-on onto a 35 mm DIN rail per EN 50022, fitting into a 45 mm wide slot — a standard footprint for this frame class. Rated for 10 A in AC-12 duty (resistive loads) and 5.5 kW at 400 V in AC-3 duty (standard motor starting), it handles the common 400 V three-phase motor range up to that power. The AC-4 rating of 8.5 A at 400 V covers reversing or inching applications where the contactor makes and breaks stalled-rotor current. The 24 VDC coil draws 3.3 W for both closing and holding, so the control transformer or DC supply needs to deliver that continuously. The operating temperature range of -25 to +60 °C suits most indoor panel environments, and the IP20 front protection means it is intended for enclosed installation only.
Mounting and Panel Integration
At 45 mm wide, 57.5 mm tall, and 72 mm deep, the 3RT1017-1BM41 occupies a compact footprint on the DIN rail. Side-by-side mounting is permitted without derating, so multiple contactors can be ganged together for multi-motor groups — a common arrangement in conveyor or pump panels. Screw terminals on the main circuit accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) solid or stranded conductors, with AWG equivalents of 2x (20 to 16), 2x (18 to 14), and 1x 12. This range covers most panel wiring from control circuits to motor feeders. For short-circuit protection, Type 2 coordination (no damage to the contactor) requires a gL/gG fuse rated 20 A. Type 1 coordination (contactor may need replacement after fault) allows a 35 A fuse. This lets the panel designer choose between tighter protection and higher fault tolerance.
Sourcing and Lifecycle
For BOM freeze or compliance documentation needs, the part carries the DIN EN 81346-2 reference code Q (power switching device). Standard Siemens documentation (datasheet, CE declaration, RoHS/REACH) applies to this active series.
Key Ratings and What They Mean for Fit
The AC-3 rating of 5.5 kW at both 400 V and 690 V means this contactor directly switches three-phase induction motors up to that power at those voltages — no external contactor needed for the motor circuit. At 500 V it also carries 5.5 kW, so the power rating is consistent across the common industrial voltage range. The AC-4 rating of 8.5 A at 400 V is the key figure for plugging or jogging duty: it tells you the contactor can break the motor's locked-rotor current repeatedly. If your application requires frequent reversals, this is the rating to check against your motor's starting current. Pollution degree 3 means the contactor is rated for industrial environments where conductive pollution occurs or dry non-conductive pollution becomes conductive due to condensation. This is the standard rating for most control panels not in clean-room or climate-controlled spaces. Maximum operating altitude is 2 000 m without derating. Above that, air density affects dielectric strength and cooling — for installations at higher elevations, consult the Siemens application manual for the derating curve.