{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1NF20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1NF20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1NF20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1NF20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 2 NO solid-state-compatible contacts, screw terminals, for 3RT2.2/3/4 contactors and 3RH2 contactor relays, IP20 front, 690 V insulation voltage.","salesMarkdown":"## What it fits and what the contacts handle The Siemens 3RH2911-1NF20 is a front-mounted auxiliary switch block for the SIRIUS contactor family, specifically designed for the 3RT2.2, 3RT2.3, and 3RT2.4 sizes as well as 3RH2 contactor relays. It provides two normally open (NO) contacts rated for solid-state loads — meaning they switch cleanly at the low-voltage, low-current levels typical of PLC inputs and electronic modules, not just the higher currents of conventional pilot-duty circuits. Contact reliability is specified as one incorrect switching operation per 100 million operations at 5 V, 1 mA, so it's trustworthy for direct wiring to a 24 VDC digital input card without an interposing relay. The block snaps onto the contactor front via the standard SIRIUS clip — no tools needed, and it occupies 36 mm width, 37.5 mm height, and 43.7 mm depth, staying within the contactor's own envelope. ## Wiring and lifecycle Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or the AWG equivalents — standard for panel wiring with ferruled stranded conductors. Mechanical service life is 5 million operating cycles typical, which is the contactor's own mechanical endurance — the block won't wear out before the base unit.","metaTitle":"Siemens 3RH2911-1NF20 SIRIUS Auxiliary Switch, 2 NO, solid-s","metaDescription":"Siemens 3RH2911-1NF20 SIRIUS auxiliary switch block, 2 NO solid-state-compatible contacts, screw terminals, for 3RT2.2/3/4 contactors. Active production, sourced to order against R","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT2.2/3/4","Depth":"43.7 mm","Width":"36 mm","Height":"37.5 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"0","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","Instantaneous Contact":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a623da24335f6c42a0995a98ad5d1a13.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=22182&mlfb=3RH2911-1NF20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1NF20/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'with 3RT2.2/3/4' mean for this auxiliary switch?","answer":"It means the 3RH2911-1NF20 is designed to mount on the front of Siemens SIRIUS contactors in the 3RT2.2, 3RT2.3, and 3RT2.4 frame sizes, and on 3RH2 contactor relays."},{"question":"What are the key electrical ratings of the 3RH2911-1NF20?","answer":"The auxiliary switch provides two NO solid-state-compatible contacts rated for 0.3 A at both 24 V and 60 V, with a contact reliability of one fault per 100 million operations at 5 V, 1 mA. Insulation voltage is 690 V AC at pollution degree 3, and surge voltage resistance is 6 kV."},{"question":"Where can I buy the 3RH2911-1NF20 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will the 3RH2911-1NF20 drop into a panel specified around a 3RT5064-6AP36-0TH0 without rewiring?","answer":"No — the 3RT5064-6AP36-0TH0 is a power contactor in a different frame size (S6/S10, 110 kW at 400 V) and uses a different auxiliary interface. The 3RH2911-1NF20 is designed for the 3RT2.2/3/4 and 3RH2 series only."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1NF20","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RH2911-1NF20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}