SIRIUS S0 Power Contactor with 220 VDC Coil
The Siemens SIRIUS 3RT2026-2BM40-ZW97 is a size S0 power contactor with a 220 V DC coil and spring-type terminals on the magnet coil. It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715, fitting into a 45 mm wide DIN slot — standard for a three-pole contactor in this frame class. Rated for continuous duty, the DC coil pulls in at 80 % of rated voltage (176 V) and holds at 110 % (242 V), giving a reliable pick-up margin for long cable runs where voltage drop is a concern. Switching frequencies range from 1 000 operations per hour in AC-1 resistive duty down to 250 per hour in AC-4 plugging/reversing service — the AC-3 motor-switching rate of 750 ops/h covers most conveyor and pump cycles. Auxiliary switch contacts are included (18... 8 per the main contact rating), so the unit can report its state back to a PLC or safety relay without a separate add-on block.
Switching Capacity by DC Voltage
For DC load switching, the contactor's rated operational current drops with voltage: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V. At 400 V DC it manages 3 A. These are the make-and-break limits for resistive DC loads — inductive loads need additional arc suppression or derating.
Mounting and Clearance
The contactor occupies a 45 x 102 x 107 mm envelope (W x H x D). Minimum clearances to adjacent metalwork: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when fitting into a crowded gland plate or angled sub-panel. Power and control wiring accepts solid or stranded conductors from 1 to 10 mm², with double ferruled strands down to 2x 0.5... 2.5 mm². The spring-type coil terminals reduce wiring time compared to screw clamps — no torque driver needed.
Environmental Range and Lifecycle
Operating temperature spans -25 to +60 °C; storage range is -55 to +80 °C. The contactor's typical mechanical life is 10 million operations. Arcing time on break is 10... 10 ms, and the DC dropout delay runs 15... 17.5 ms — relevant when sequencing contactors in a star-delta or reversing starter. The lifecycle stage is marked as current production. No end-of-life notification or successor part is recorded on this order code. Sourcing is handled on a quoted-to-order basis against an RFQ through independent distribution channels.