S0 frame, 45 mm — what fits in the panel
The 3RT2025-1BG40: Screw and snap-on mounting gives you the option to clip it onto the rail or bolt it to a backplate. That 6 mm side gap is the binding constraint when packing multiple contactors side-by-side — plan for it in the gland-plate layout.
Wire termination and what it accepts
For fine-stranded or ferrule-terminated wire, the same range applies — 1 to 10 mm². The magnet coil connection uses screw-type terminals — no push-in or spring-cage here. Torque spec is not listed in this record, but the screw size for main contacts is 16 to 8 (likely M4 or M5 depending on lug).
Switching duty and operating limits
Rated for 1,000 switching cycles per hour in AC-1, AC-2, AC-3, and AC-3e duty — that covers resistive, slip-ring motor, squirrel-cage motor, and high-efficiency motor loads. In AC-4 duty (plugging/reversing/inching) the rate drops to 300 cycles per hour. Mechanical endurance is 10 million typical operations. The 3 hp rating at 230 V gives a quick motor-size reference for North American panels. The operating factor (on/off ratio) has an initial value of 0.8 and a full-scale value of 1.1 — meaning it can run slightly above continuous rating in intermittent duty.
If you need a pin-compatible alternative, the closest sibling is another 3RT2025 variant with the same S0 frame and terminal layout — the difference is the coil voltage and auxiliary contact configuration.