{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4FA04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4FA04","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4FA04","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FA04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch 3RH2911-4FA04, snap-on front mounting for contactor sizes S00, S0, S2, S3, ring terminal lug connection, rated 10 A AC-12, 6 A at 24 V.","salesMarkdown":"It fits frame sizes S00, S0, S2, and S3. The connection method is ring terminal lug. The switch is rated for a surge voltage of 6 kV, which aligns with IEC 60947-1 overvoltage category III for 400 VAC systems. It also carries a mirror contact function per IEC 60947-4-1 when used with a 3RT2 contactor — meaning the normally closed contact cannot remain closed if the main contactor welds. That is a safety feature for applications where you need to reliably detect a welded contactor, like in a safety circuit. This auxiliary switch snaps onto the front of the contactor. Dimensions are 36 mm wide, 37.5 mm high, and 43.7 mm deep. Front protection class is IP00.","metaTitle":"Siemens 3RH2911-4FA04 SIRIUS Auxiliary Switch, 10 A AC-12, s","metaDescription":"Siemens SIRIUS auxiliary switch 3RH2911-4FA04 for contactor sizes S00-S3. Rated 10 A AC-12, 6 A at 24 V. Snap-on front mounting. Current lifecycle. Sourced to order.","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, S0, S2, S3","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","Suitability For Use":"Contactor relay and power contactor","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":"for snapping onto the front","Instantaneous Contact":"0","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":"Yes; with 3RT2","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/3b02266d2baa254bc1f8dd1f819a3e12.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=125218&mlfb=3RH2911-4FA04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FA04/alternatives.json"},"ai":{"faq":[{"question":"What is the connection type on this auxiliary switch?","answer":"Ring terminal lug connection. You wire ring lugs onto the terminals, not spring-cage or screw-clamp."},{"question":"Does this switch have a mirror contact function?","answer":"Yes, it provides a mirror contact per IEC 60947-4-1 when used with a 3RT2 contactor. The normally closed contact cannot remain closed if the main contactor welds."},{"question":"What is the contact reliability at low signal levels?","answer":"Rated at 1 faulty switching per 100 million operations at 17 V, 1 mA. That is a strong low-energy reliability figure for PLC inputs or dry-contact circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4FA04","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/3RH2911-4FA04 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}}