{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4GA31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4GA31","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4GA31","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4GA31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, front-mounted, 3 NO + 1 NC, 10 A maximum, ring cable lug connection, snap-on mounting, for 3RH2 contactor relays.","salesMarkdown":"The Siemens SIRIUS 3RH2911-4GA31 is a front-mounted auxiliary switch block designed specifically for the 3RH2140 and 3RH2443 contactor relay frames. It provides 3 normally open and 1 normally closed instantaneous contacts, physically coded so it only mounts on those two base units — a detail that prevents misassembly on the wrong relay. The contact configuration is 53/54 (NO), 61/62 (NC), 73/74 (NO), 83/84 (NO). The maximum continuous current is 10 A, but the real selection parameter is the voltage-specific switching capacity. For DC circuits the derating is steeper: 10 A at 24 V DC, 4.7 A at 60 V DC, 1.2 A at 220 V DC, and 0.26 A at 600 V DC. These are the values that govern whether the contacts survive the inrush and break the load without welding — the 10 A maximum is a thermal limit, not a universal switching rating. The AC-15 rating at 690 V is 1 A, which covers solenoid valve and electromagnetic brake loads at that voltage level. The insulation voltage is rated 690 V at pollution degree 3, and surge voltage resistance is 6 kV — both confirm the block is suitable for industrial environments where transient overvoltages are common. ## Contact reliability and service life ## Connection and wiring Termination is via ring terminal lug connection — not screw terminals or spring cages. That means the installer needs to crimp ring lugs onto the control wiring before landing them on the block. The physical coding (a mechanical key) ensures the block only fits the intended 3RH2 base units, so a panel builder cannot accidentally install it on a different contactor relay family.","metaTitle":"Siemens 3RH2911-4GA31 SIRIUS Auxiliary Switch, 3NO+1NC, 10A","metaDescription":"Siemens SIRIUS 3RH2911-4GA31 front-mounted auxiliary switch block for 3RH2 contactor relays. 3 NO + 1 NC, 10 A max, ring terminal lug connection. Snap-on mounting. Sourced to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","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":"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","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":"3","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/71ebd459e21c2e45bf873f92c7644d62.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=38234&mlfb=3RH2911-4GA31","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4GA31/alternatives.json"},"ai":{"faq":[{"question":"What contactor relays does 3RH2911-4GA31 fit?","answer":"It is physically coded to mount only on the 3RH2140 and 3RH2443 contactor relay frames, per the manufacturer's specification."},{"question":"What is the maximum switching current at 24 V DC?","answer":"At 24 V DC the rated switching current is 10 A. At 60 V DC it drops to 4.7 A, and at 220 V DC it is 1.2 A."},{"question":"What type of connection does this auxiliary switch use?","answer":"It uses ring terminal lug connection for the auxiliary and control circuits — not screw terminals or spring-cage clamps."},{"question":"Where can I buy 3RH2911-4GA31 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4GA31","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/3RH2911-4GA31 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}}