Siemens 3RH1911-2FA40 Contact Block

Siemens 3RH1911-2FA40 is an auxiliary switch block that adds four normally open contacts to compatible Siemens contactors and relays, delivering signaling and interlock capabilities in compact S00 form factor. It uses EN 50005 spring-type terminals for reliable connections and is designed for auxiliary and motor contactors in control panels. The block provides 4 NO contacts (0 NC) with an insulation rating of 690 V and surge withstand of 6 kV, and it offers a mechanical life of about 10,000,000 switching cycles with an electrical life around 200,000 cycles at AC-15 / 230 V. Operating current for the NO contacts at AC-12 is up to 10 A across voltages from 24 V to 690 V. The 3RH1911-2FA40 is intended as an add-on accessory for Siemens Sirius 3RH/3RH2 family contactors, enabling reliable auxiliary signaling in motor-control and automation circuits without altering main contacts.