The Siemens 3RH2140-1AV60 is a SIRIUS auxiliary contactor — a 4 NO contact block in the size S00 frame, designed to switch control signals rather than motor loads directly. This is the part you spec when a PLC output or relay needs to drive multiple loads through isolated contacts, or when you need to interlock contactors in a reversing or star-delta circuit. The 4 NO configuration gives you four independent make contacts that close together on coil pickup. Rated impulse withstand voltage is 6 kV, and the pollution degree is 3 — the contactor is designed for the conductive-dust and humidity conditions typical of industrial control panels, not clean-room or office environments.
The contacts are rated for different currents depending on the switched voltage and load type. At 24 V the rated value is 10 A; at 230 V it is also 10 A. For DC switching at 60 V the rated current is 4.7 A; at 220 V DC it is 1.2 A. These are the thermal current ratings for the contact set — the actual make/break capacity depends on the load power factor and duty cycle. This means the contactor can handle frequent signalling in a high-cycle application like a pick-and-place machine or a packaging line, but the arcing time sets a lower bound on how fast you can sequence the contacts without overlap.
Dimensions are 73 mm deep, 45 mm wide, and 57.5 mm high. That covers most control-circuit wiring up to 12 AWG.
The product extension for auxiliary switches is supported, meaning you can add contact blocks to the side of this contactor if the 4 NO configuration is not enough. The RoHS substance prohibition date is 10/01/2009, confirming compliance with the EU RoHS directive. Relative humidity minimum is 10 %. Mechanical endurance is 30 million operations typical — the contactor will outlast the panel it sits in under normal control-circuit duty.