The Siemens SIRIUS 3RH1140-2BW40 is a Size S00 auxiliary contactor with a 48 VDC coil and four normally open (4 NO) instantaneous contacts. It mounts via screw or snap-on onto a DIN rail, occupying 45 mm width in the panel — a standard footprint for this frame size. Rated operational current is 10 A at 24 V, derating to 6 A at 230 V and 3 A at 400 V. The DC coil draws 3.2 W for both closing and holding, so no additional power budget is needed for a separate hold-in circuit. Contact reliability is specified at one incorrect switching per 100 million operations at 17 V, 1 mA — suitable for dry-circuit PLC inputs where low-level switching is required.
Panel Fit and Wiring
Dimensions are 73 mm deep × 45 mm wide × 60 mm tall. The screw terminals accept 2x (0.25 to 2.5 mm²) solid or stranded, or 2x (24 to 14 AWG). Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in crowded enclosures. IP20 protection on the front means it's suitable for enclosed panels where no one touches live parts. Pollution degree 3 rating allows use in industrial atmospheres with conductive dust or occasional condensation.
Lifecycle and Compliance
Substance prohibitance date of 07/01/2006 confirms RoHS compliance from that date forward. Surge voltage resistance rated at 6 kV. Mechanical life is rated at 30 million switching operations, typical for a contactor of this size. Shock resistance is 10g at 5 ms and 5g at 10 ms, adequate for most fixed industrial equipment.
Sourcing and Availability
The 3RH1140-2BW40 is a standard catalog item in the SIRIUS auxiliary contactor line. For current pricing and lead time, submit an RFQ — availability and firm pricing are confirmed at quote time through independent distribution channels.