{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA31","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA31","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4HA31 auxiliary switch, 3 NO instantaneous contacts, snap-on front mounting for S00/S0/S2/S3 contactors, ring terminal lug connection, 43.7 mm depth, IP00 front.","salesMarkdown":"The Siemens SIRIUS 3RH2911-4HA31 is a front-mounted auxiliary switch block carrying three normally-open instantaneous contacts. It snaps onto the front of SIRIUS contactors in frame sizes S00, S0, S2, and S3 — that covers the 3RT2 and 3RT1 families from about 7 A up through 300 A motor loads. The ring terminal lug connection means you land ring forks on the screw terminals, not push-on spades or cage clamps; plan your wire prep accordingly. Three NO contacts, zero NC, zero lagging contacts. If your safety circuit demands a positively-guided NC, this block cannot provide it — you need a different variant. The AC-15 rating at 690 V is 1 A; that is the inductive switching limit for solenoid and contactor coils at high line voltage. At 24 V the AC-15 rating climbs to 10 A, so it handles multiple small contactor coils in parallel without a separate interposing relay. The mirror-contact feature per IEC 60947-4-1 applies when used with 3RT2 contactors — relevant for applications requiring welded-contact detection in motor circuits. That is the dry-circuit threshold — if your signal chain runs at logic-level voltage and milliamps, this block is rated for it. Snap-on front mounting — no tools, no DIN rail. The block clips directly onto the contactor's front face. Dimensions are 36 mm wide, 43.7 mm deep, 37.5 mm high. The IP00 front rating means no ingress protection on the front face; the contactor's own enclosure provides the panel-level IP rating.","metaTitle":"Siemens SIRIUS 3RH2911-4HA31 Auxiliary Switch, 3 NO + 0 NC,","metaDescription":"Siemens SIRIUS 3RH2911-4HA31 auxiliary switch, 3 NO contacts, snap-on mounting for S00-S3 contactors. AC-15 rated 10 A at 24 V, 1 A at 690 V. Current production. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-4HA31","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","description":"auxiliary switch, on the front, 3 NO + 1 NC,.1/.2,.3/.4,.3/.4,.3/.4, current path: 1 NC, 1 NO, 1 NO, 1 NO, ring cable lug connection, for contactors 3RT2 and contactor relays 3RH2","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":"3","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5bbb01e219e5579ed0aad86c1f1ace06.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=357828&mlfb=3RH2911-4HA31"},"ai":{"faq":[{"question":"What are the key switching ratings for this auxiliary switch?","answer":"Three NO contacts rated AC-15: 10 A at 24 V, 3 A at 110 V, 1.2 A at 220 V, 1 A at 690 V. Also carries 6 A at 24 V for general-purpose switching. Contact reliability is one fault per 100 million operations at 17 V, 1 mA."},{"question":"What contactors does the 3RH2911-4HA31 fit?","answer":"It snaps onto the front of SIRIUS contactors in frame sizes S00, S0, S2, and S3. This covers the 3RT2 and 3RT1 series from small 7 A frames up through the larger 300 A class contactors."},{"question":"Does this auxiliary switch have mirror contacts?","answer":"Yes, the mirror contact feature per IEC 60947-4-1 is confirmed when used with 3RT2 contactors. This is relevant for motor circuits where welded-contact detection is required for safety functions."},{"question":"What is the connection type on the 3RH2911-4HA31?","answer":"Ring terminal lug connection for the auxiliary and control circuits. Wire preparation requires ring terminals, not ferrules or spade connectors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA31","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/3RH2911-4HA31 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}