What it is
The Siemens 3RT2026-2BM40 is a SIRIUS power contactor in the S0 frame size. It switches motor loads in control panels, rated for AC-3 duty at up to 750 operating cycles per hour. The coil is 24 VDC; the main contacts terminate via spring-type terminals (cage-clamp style), accepting solid or stranded conductors from 1 to 10 mm². Mounts on a 35 mm DIN rail per EN 60715, with screw-and-snap fastening. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward.
Key ratings & what they mean
The AC-3 switching frequency of 750 cycles/hour means this contactor can handle repeated motor start/stop cycles typical of conveyor or pump duty without overheating the coil or contacts. For DC switching, the contactor is rated at 10 A at 24 V, 2 A at 48 V, and 0.3 A at 220 V — these are resistive-load values; inductive DC loads will require derating. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. The 10 mm clearance to adjacent devices (upwards, forwards, downwards) is the minimum for heat dissipation and arc containment.
Integration notes
Panel footprint: 45 mm wide, 102 mm tall, 107 mm deep. Side clearance drops to 6 mm. The auxiliary switch block is present (yes), so add-on contact blocks are not required for basic status feedback. Spring terminals accept 2x (0.5... 2.5 mm²) for control wiring. Torque not specified — typical for spring clamps, no tool needed beyond a screwdriver for release.