The Siemens SIRIUS 3RT2026-1BP40 is a Size S0 power contactor with screw-type terminals on the magnet coil and main contacts. It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715, making it a direct fit for standard industrial control panels. The contactor is rated for 3 hp at 230 V and carries DC switching capability up to 10 A at 24 V, 2 A at 48 V, and 0.3 A at 220 V — useful for DC motor brake or solenoid loads in mixed-voltage cabinets.
Duty-cycle and switching frequency
Maximum switching frequency depends on the load duty: 1 000 operations per hour at AC-1 (resistive), 750/h at AC-2 and AC-3 (motor starting/running), 250/h at AC-4 (plugging/inching), and 750/h at AC-3e. For a conveyor or pump running continuous motor duty, the 750/h ceiling is the practical limit; the 250/h AC-4 ceiling matters only if the contactor sees frequent reversing or jogging.
Environmental and mounting flexibility
Operating temperature range is -25 to +60 °C; storage range extends to -55 to +80 °C. The contactor can be rotated ±180° on a vertical surface and tilted forward/backward ±22.5°, which helps when fitting into tight gland-plate layouts or angled subpanels. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the sides.
Wiring and auxiliary contacts
Main contact terminals accept solid or stranded conductors from 1 to 10 mm². Auxiliary switch terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The contactor includes an auxiliary switch as standard, so no separate add-on block is needed for basic status feedback.