The Siemens 3RH1131-2KV40 is a SIRIUS coupling relay, size S00, designed for switching auxiliary circuits in control panels. The contact reliability spec — one incorrect switching operation per 100 million cycles at 17 V, 1 mA — confirms it is suited for low-level signal switching where oxidation on dry contacts is a concern. The built-in varistor surge suppressor protects the coil drive circuit from voltage spikes, which is relevant when the relay is driven by a solid-state output on a PLC or safety relay.
Strip length is standard for this terminal family.
Key ratings and their meaning
Pollution degree 3 means it is designed for the conductive pollution environment typical of factory floors — no special conformal coating required for normal use. The thermal and shock ratings — 10g for 5 ms and 5g for 10 ms — cover the vibration found on machine-mounted panels or near heavy rotating equipment. The contacts are rated for switching at various voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are the thermal current ratings for the auxiliary contacts — they define the maximum continuous current the contacts can carry, not the motor starting current.