The Siemens 3RH2140-1AL00 is a SIRIUS auxiliary contactor, size S00, with four normally-open instantaneous contacts and a 24 VDC coil. It is designed for control-circuit switching — signalling, interlocking, or extending the contact count of a main contactor — rather than direct motor loads.
The arcing time sits between 10 and 15 ms at DC; for AC loads the switching time is 4 to 15 ms. If you're timing a sequence off these contacts, account for that spread. Contact ratings vary by voltage: 10 A at 230 V AC, 3 A at 400 V AC, 1 A at 690 V AC. At DC voltages, the current drops faster — 4.7 A at 60 V, 0.5 A at 440 V. That's the arc-quenching limit; don't assume the AC rating holds for DC circuits.
The 3RH2140-1AL00 is listed as current production.
That's the minimum air gap for arc dissipation and heat rise — don't crowd it against other components. Wiring accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded. Screw terminals, so torque to the manufacturer's spec — no spring-cage here.