What it is and where it lands
The 3RT2026-2BB40-ZW96 is a Siemens SIRIUS power contactor in the S0 frame size, designed for switching motor loads up to the AC-3 duty class at 750 operations per hour. Its 24 V DC coil pulls in at 80% of rated voltage and drops out between 15 and 17.5 ms after coil removal — a tight dropout window that matters for coordinated safety circuits. This contactor mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward. That flexibility simplifies panel layout when orientation is constrained by cable entry or busbar access.
What the ratings mean for fit
The S0 frame carries main contacts rated for AC-3 switching at up to 750 cycles per hour, with a mechanical life of 10 million operations typical. That cycle limit governs the contactor's suitability for high-duty applications like conveyor indexing or compressor cycling — not just continuous run. For resistive loads (AC-1) the maximum switching rate rises to 1 000 1/h, while heavy inrush (AC-4) drops to 250 1/h. Spring-type terminals on the coil accept solid or stranded wire from 1 to 10 mm², and up to 2x 0.5 to 2.5 mm² per clamp. No screw torque to verify — just strip to 8–10 mm and push in. That saves time during panel build and avoids loose-termination callbacks. The auxiliary contact block is built in, with a configuration of 1 NO + 1 NC (18... 8 in Siemens notation). Its DC breaking capacity is rated at 10 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — so it handles PLC-level feedback signals but not high-DC loads without derating.
Panel integration details
Dimensions are 45 mm wide, 102 mm tall, 107 mm deep — the S0 footprint fits standard 45 mm pitch on DIN rail. Clearance distances are specified: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm to the side. These are the minimum air gaps to adjacent metalwork for arc flash containment; a panel builder should not crowd the contactor tighter than that without checking coordination with upstream protection. Operating temperature range is -25 to +60 °C, storage range -55 to +80 °C. The arcing time is 10 ms per pole — fast enough to limit let-through energy in a fault scenario, but the upstream breaker's I²t curve should be verified for selectivity.