What it is and where it fits
The Siemens 3RH1140-1AP00-1AA0-ZX95 is a SIRIUS auxiliary contactor in size S00, carrying four normally-open instantaneous contacts. It's the part that mirrors the main contactor's state in a motor starter or feeds status back to a PLC — no coil on this one, just the contact block that switches when the main contactor pulls in. Rated 10 A at 24 V, with a 6 kV surge voltage withstand, it's built for control circuits in panels where you need extra NO contacts without adding a separate relay.
Mounting and wiring
Mounts via screw or snap-on onto a DIN rail — the 45 mm width keeps it to a single module slot. Standing on a horizontal surface is the specified orientation. Terminals accept solid wire: two conductors at 0.5–1.5 mm², two at 0.75–2.5 mm², or two at 4 mm². That covers most control wiring gauges without needing ferrules, though stranded will want them. IP20 on the front means it's protected against finger contact but lives inside an enclosure.
Ratings and what they mean
The 10 A at 24 V is the continuous thermal current — that's the limit for a single contact path in a 24 VDC control circuit. At 230 V AC it's rated 6 A, and at 400 V AC it drops to 3 A. Those are the make-and-break capacities for pilot duty; don't plan on switching motor loads through these contacts. The 6 kV surge voltage rating (impulse withstand) means it coordinates with standard industrial control panels without extra suppression on the contact block itself. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that's the dry-circuit performance for low-level signals.