The Siemens 3RH1140-1AK60-1AA0 is a SIRIUS auxiliary contactor in the compact S00 frame size, carrying 4 normally-open instantaneous contacts rated for 10 A at 24 V under AC-12 duty. It mounts via screw or snap-on to DIN rail, occupying 45 mm of panel width — a tight fit for crowded control cabinets where every millimeter of rail space is accounted for.
Ratings and what they mean for fit
The 10 A AC-12 rating at 24 V is the headline figure — AC-12 covers resistive loads and solid-state output circuits, so this contactor is sized for control-signal switching (PLC outputs, relay coils, indicator lamps) rather than motor starting. At 230 V the rating drops to 6 A, and at 400 V to 3 A; derate accordingly when mixing voltage levels in the same panel. The four NO contacts switch instantaneously — there are no delayed, leading, or lagging contacts on this variant. That makes it a straight signal repeater: all four close at the same moment the coil picks up, with no sequencing for staggered load application. Operating temperature range of -25 to +60 °C covers most indoor industrial environments, including non-conditioned enclosures near process equipment. Storage and transport tolerance down to -55 °C is a handling spec, not a running condition.
Panel integration and wiring
Screw and snap-on mounting to DIN rail — no tools needed for the snap-on, but the screw terminals accept solid conductors from 0.5 mm² up to 4 mm² (two per clamp). Strip length and ferrule sizing follow standard practice for the 0.5–2.5 mm² range; the 4 mm² entry handles larger PE or common-feed wires without pigtailing. Dimensions of 45 mm wide by 57.5 mm high by 72 mm deep place it in the S00 footprint shared across the SIRIUS 3RT2 contactor family. If you're replacing a 3RT1015-1AG61 or 3RT1016-1AG61 in an existing panel, the 3RH1140-1AK60-1AA0 occupies the same DIN-rail slot and wiring zone — no re-drilling or re-routing of the gland plate needed. Mounting position is standing on a horizontal surface; side clearance of 0 mm to adjacent devices is permitted, so you can pack these tight on the rail without derating for heat buildup at rated current.