The Siemens 3RH2140-2AP00-ZW97 is a SIRIUS auxiliary contactor in size S00, carrying 4 normally-open instantaneous contacts. It switches control and signal circuits in motor starter and contactor assemblies — the NO contacts handle pilot duty, PLC inputs, or interlocking logic where the main contactor's auxiliary block is already full. Dimensions are 73 mm deep, 45 mm wide, 70 mm high, with a 10 mm clearance required on all sides (upwards, downwards, forwards, and 6 mm at the side) for arc dissipation and airflow.
The 4 NO contacts are rated for 10 A at 230 V AC (50/60 Hz), which covers most 24–230 V AC control circuits in a panel. At 24 V DC the contacts carry 10 A; at 60 V DC it drops to 4.7 A, and at 110 V DC to 3 A — the DC derating curve is steep, so confirm your DC load voltage against the table before committing the BOM line. For higher AC voltages the contact rating steps down: 3 A at 400 V, 2 A at 500 V, 1 A at 690 V, and 0.26 A at 600 V. These are the maximum continuous currents the NO contacts can make and break at those voltages — a 690 V motor control circuit drawing 0.8 A through the auxiliary contact would exceed the 1 A limit and risk contact welding. Arcing time is 10–15 ms at AC and 4–15 ms at DC, with a maximum switching frequency of 10 000 operations per hour at DC. The mechanical life is typical 30 million operations — the electrical life will be lower and depends on the switched load.
The substance prohibition date of 10/01/2009 refers to RoHS compliance — the part meets the 2009 substance restrictions.
Strip length is 8 mm for a reliable connection under the cage. The 4 NO contacts are all instantaneous — no timed or delayed auxiliary contacts on this variant. If your circuit needs a delayed break or make, you need a different order code from the 3RH21 family.