{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4FC22","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4FC22","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4FC22","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FC22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, front-mounted, 2 NO + 2 NC, 22 U ring cable lug connection, 10 A maximum, for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"The Siemens SIRIUS 3RH2911-4FC22 is a front-mounted auxiliary switch block for 3RT2 power contactors and 3RH2 contactor relays. It provides 2 normally open and 2 normally closed auxiliary contacts arranged as 1 NO leading, 1 NO leading, 1 NC lagging, 1 NC lagging — a 22 U contact configuration that gives you sequenced make/break timing for control logic. Snap-on mounting onto the contactor front means no tools needed for installation or replacement; the block clips directly onto the contactor's front face. The 36 mm width and 43.7 mm depth keep it within the contactor's own footprint. The contacts are rated for 10 A maximum, but that's the thermal current — the actual switching capacity depends on the voltage and duty. At 24 V DC the contacts handle 6 A; at 60 V DC it drops to 2 A; at 110 V DC it's 1 A; at 220 V DC it's 0.3 A. For AC-15 inductive loads at 690 V the rating is 1 A. These are the numbers that govern whether this switch survives in your specific control circuit. Mechanical life is 10 million switching cycles typical. ## Connection and environment Termination is via ring cable lugs — not screw terminals or spring cages. That means you need a ring terminal crimped onto each wire, then bolted to the contact post. Factor that into your panel wiring plan if you're used to push-in or screw-clamp aux blocks. Protection class on the front is IP00 — it relies on the panel enclosure for environmental sealing.","metaTitle":"Siemens 3RH2911-4FC22 Auxiliary Switch, 2NO+2NC, 10A, Ring L","metaDescription":"Siemens SIRIUS auxiliary switch for 3RT2/3RH2 contactors. 2 NO + 2 NC, 10 A max, 6 kV surge, snap-on DIN rail. Sourced to order against RFQ.","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","Maximum":"10 A","at 24 V":"6 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"6 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"6 A","at 400 V":"3 A","During Storage":"-55 ... +80 °C","Leading Contact":"2","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"2","Product Brand Name":"SIRIUS","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","Instantaneous Contact":"0","at AC-15 at 690 V rated value":"1 A","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)","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/49adb7750be060a8263b251954b0d184.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=412382&mlfb=3RH2911-4FC22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FC22/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2911-4FC22 and get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability confirmation."},{"question":"What are the key ratings for 3RH2911-4FC22?","answer":"Maximum thermal current is 10 A. At 24 V DC the contacts switch 6 A; at 110 V DC it's 1 A; at 220 V DC it's 0.3 A. AC-15 rating at 690 V is 1 A. Mechanical life is 10 million cycles."},{"question":"What does the contact reliability spec mean?","answer":"The contacts are rated for one faulty switching per 100 million operations at 17 V, 1 mA — suitable for dry-contact PLC inputs and low-energy signal switching."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4FC22","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/3RH2911-4FC22 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}}