Each normally-open (NO) and normally-closed (NC) auxiliary contact is rated at 40 A, giving you plenty of headroom for pilot-duty or small-load switching. The main circuit and auxiliary circuit both carry a rated impulse withstand voltage of 6 kV, which means this contactor coordinates cleanly with upstream breakers in a panel — no surprise arc-over on a fault.
AC switching capacity is given at several voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 440 V. That's the rated operational current for the main contacts; for motor loads you'd typically use the AC-3 duty class, which this contactor supports at the listed values. Wire termination is generous: the main circuit accepts solid conductors from 2x (0.5 to 1.5 mm²) up to 2x (0.75 to 4 mm²), and stranded conductor sizes from 2x (0.75 to 25 mm²). That range covers everything from signal-level wiring to heavy motor leads. The auxiliary and control circuit also uses screw terminals, keeping the wiring method consistent across the panel.
Where it lives in the panel
The 3RT1535-1BG40 measures 130 mm deep, 73 mm wide, and 112 mm tall — the S2 footprint. It supports side-by-side mounting (zero gap between units), so you can pack several contactors tight on the DIN rail. The mounting position allows vertical surface mounting with +/-180° rotation and +/-30° tilt front-to-back, which gives flexibility in tight enclosures. That's fine for most indoor industrial environments — no special derating needed unless you're near a heat source.
If you're filling a BOM line and need to confirm fit, the key dimensions and terminal capacity are covered above. This contactor is a direct fit for any panel designed around the SIRIUS S2 frame with screw terminals. No adapter or rework required.