Panel fit and mounting
The 3RT2026-2AL24 is a size S0 power contactor from the Siemens SIRIUS family, designed for screw and snap-on mounting onto 35 mm standard mounting rail per DIN EN 60715. Its 45 mm width and 144 mm depth define the DIN-rail footprint — plan for that depth when sizing the enclosure depth, especially with gland plates or busbar systems behind the rail. Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5° on a vertical surface. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These are the minimum air gaps for arc flash and heat dissipation — don't crowd the contactor against cable ducts or adjacent devices.
Coil and switching ratings
The magnet coil uses spring-type terminals (cage clamp) — no screw torque to verify, which speeds panel wiring. Coil ratings at 24 V rated value: 6 A. At 48 V: 2 A. At 60 V: 2 A. At 110 V: 1 A. At 125 V: 0.9 A. At 220 V: 0.3 A. At 400 V: 3 A. At 440 V: 0.6 A. These are the contact ratings at those voltages — match your load voltage to the appropriate row for the actual switching capacity. Motor load rating at 230 V: 3 hp. At 400 V: 3 A. The AC-1 (resistive) maximum operating frequency is 1,000 operations per hour; AC-2 and AC-3 (motor starting/running) at 750 ops/h; AC-4 (plugging/reversing/inching) at 250 ops/h. For high-duty-cycle applications like frequent reversing, the AC-4 limit governs — don't exceed 250 cycles per hour.
Termination and wiring
Main contact terminals accept solid or stranded wire from 1 to 10 mm². For fine-stranded or ferrule-terminated wire, the dual-entry specification allows 2x (0.5 to 2.5 mm²). The spring-type terminals on the coil side match the same cage-clamp family — consistent tooling across the contactor.
Environmental limits
Operating temperature range: -25 to +60 °C. Storage temperature: -55 to +80 °C. The storage limit governs handling and warehousing, not running — the contactor can sit in a cold warehouse but must be within the operating range when energized.