{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4GA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4GA40","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4GA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4GA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH2911-4GA40, 4 NO, snap-on mounting for S00 contactors, 10 A AC-12, ring terminal lug connection.","salesMarkdown":"The Siemens 3RH2911-4GA40 is a SIRIUS auxiliary switch block designed to snap onto the front of a 3RH2140 or 3RH2440 contactor relay (size S00). It gives you four normally-open instantaneous contacts, rated 10 A at AC-12 (resistive) and 6 A at 24 V for typical control loads. The ring terminal lug connection means you're landing ring lugs, not ferrules — plan the panel wiring accordingly. Snap-on mounting directly onto the contactor relay — no DIN rail required, no extra bracket. The block is 36 mm wide, 43.7 mm deep, and 37.5 mm tall, so it tucks into the S00 footprint without stealing panel space. IP00 on the front means it's not sealed; keep it inside a clean, dry enclosure away from washdown or dust. The AC-12 rating (10 A) covers resistive loads like pilot lights and contactor coils. For inductive control circuits (AC-15), the switch is good for 1 A at 690 V. The DC ratings are more modest: 6 A at 24 V, 2 A at 48 V, 1 A at 110 V, and 0.3 A at 250 V. If you're switching a DC solenoid at 125 V, the 0.9 A limit is the one to watch. ## What it is not This switch is not a mirror contact per IEC 60947-4-1, so it cannot serve as a feedback contact for a safety circuit that requires mirror contacts. It has no leading or lagging contact — all four NO contacts close and open together.","metaTitle":"Siemens 3RH2911-4GA40 SIRIUS Auxiliary Switch, 4 NO, 10 A AC","metaDescription":"Siemens 3RH2911-4GA40 SIRIUS auxiliary switch, 4 NO contacts, 10 A AC-12, snap-on mounting for S00 contactors. Current production. Sourced to order. RFQ for price and lead time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","Height":"37.5 mm","at 24 V":"6 A","at 48 V":"2 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"0.3 A","at 400 V":"3 A","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Category":"Auxiliary switch","Lagging Switching":"0","Size Of Contactor":"S00","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","Suitability For Use":"Contactor relay","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 440 V rated value":"0.5 A","at 600 V rated value":"0.26 A","Design Of The Product":"Can be snapped onto front of 3RH2140/3RH2440 auxiliary switch","Instantaneous Contact":"4","Substance Prohibitance (Date)":"10/01/2009","protection class IP on the front":"IP00","Surge Voltage Resistance Rated Value":"6 kV","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"No","operational current at AC-15 at 690 V rated value":"1 A","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","Type Of Electrical Connection For Auxiliary And Control Circuit":"ring terminal lug connection","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2e0a48ec5808f52009f8da5fc132c3b6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=533031&mlfb=3RH2911-4GA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4GA40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2911-4GA40 drop into a panel that was specified around 3RH2140-1BP40 without rewiring?","answer":"Yes, the 3RH2911-4GA40 is designed to snap onto the front of a 3RH2140 contactor relay. The wiring is the same ring terminal lug connection; no rewiring needed."},{"question":"What are the key dimensions of 3RH2911-4GA40?","answer":"Width 36 mm, depth 43.7 mm, height 37.5 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4GA40","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/3RH2911-4GA40 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}}