What it is and what it does
The Siemens 3RH1140-1AP00-ZW97 is a SIRIUS auxiliary contactor in the S00 frame size. It provides 4 normally-open instantaneous contacts for switching control circuits, signal interlocking, or extending the contact count on a main contactor or starter. Rated for 10 A at 24 V and carries a 6 kV surge voltage resistance, so it handles typical 24 VDC control loops common in industrial panels without additional suppression. Contact reliability is rated at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — meaning it can be trusted for dry-contact PLC inputs where low-level switching is critical.
Mounting and integration
Mounts via screw or snap-on to DIN rail. The S00 footprint is 45 mm wide, 57.5 mm tall, 72 mm deep — standard for this frame size, so it fits existing S00 layouts without panel rework. Mounting position is flexible: +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward or backward. This helps when fitting into crowded enclosures or angled subpanels. Front protection is IP20 — finger-safe for the panel face but not sealed; keep it inside a cabinet away from washdown or dust.
Wiring and termination
Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². This covers standard control wiring from signal-level pairs up to 4 mm² for heavier pilot circuits.
Environmental and compliance
Operates from -25 to +60 °C; stores and transports from -55 to +80 °C. Pollution degree 3, so it's suited for industrial environments with conductive dust or humidity. Shock rated at 10g / 5 ms and 5g / 10 ms — robust enough for machine-mounted applications with vibration. RoHS compliance date listed as July 1, 2006, confirming it meets the EU substance restrictions.