The Siemens SIRIUS 3RH6140-1BM40 is a contactor relay — size S00 — with four normally open auxiliary contacts (40 E switching element code) and a 24 VDC coil. It switches control circuits, not motor loads directly: the 4 NO contacts handle up to 6 A at 24 V, 3 A at 110 V, 1.2 A at 220 V, and 10 A at 230 V (AC-12), with a mechanical life of 30 million operations on the base relay.
Screw terminals accept 2x (0.5 to 2.5 mm²) solid/stranded or 2x 4 mm² — strip length is standard, no special tooling needed for the panel wireman.
Switching capability and contact reliability
Rated for 1 000 switching cycles per hour in DC-12 and DC-13 duty — that governs the real-world pick-and-place or valve-bank application, not the no-load mechanical rate. The auxiliary switch block adds another 10 million mechanical operations on top of the base relay's 30 million, so the contactor relay outlasts most machine lifecycles.