The Siemens 3RH1140-1BB40-0TK0-ZX95 is a SIRIUS auxiliary contactor in size S00, carrying four normally-open (4 NO) instantaneous contacts and a 24 V DC coil. It mounts via screw or snap-on onto a DIN rail — the standard footprint for panel builders. Rated mechanical endurance is 30 million operations, with contact reliability of one incorrect switching per 100 million at 17 V, 1 mA. The IP20 front protection suits enclosed control panels; pollution degree 3 covers industrial environments with conductive pollution.
Ratings and what they mean for fit
The 24 V DC coil draws 3.2 W closing and holding power — consistent with a low-energy control circuit. For switching loads, the contact ratings vary by voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. That means at 400 V line it handles 3 A inductive or resistive loads; at 690 V it drops to 1 A. The 6 kV surge voltage resistance ensures coordination with upstream surge protection in industrial panels. Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², and 2x 4 mm² (or AWG equivalents 2x 20–16, 2x 18–14, 1x 12). The clamping range covers most control wiring gauges used in panel builds. Depth is 72 mm, width 45 mm, height 57.5 mm — compact enough for dense DIN-rail layouts.
Mounting and integration
Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward. Fastening is screw or snap-on onto a DIN rail — no adapter needed. The size S00 body fits standard 45 mm wide slots. Operating temperature range -25 to +60 °C; storage and transport -55 to +80 °C. Shock resistance rated 10g / 5 ms and 5g / 10 ms.