{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1HA31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1HA31","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1HA31","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1HA31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3 NO + 1 NC, screw-type terminals, 10 A maximum, snap-on mounting, 36.5 x 41.5 x 37.5 mm.","salesMarkdown":"The Siemens SIRIUS 3RH1911-1HA31 is a 4-pole auxiliary switch block with a 3 NO + 1 NC contact configuration, designed for snap-on mounting onto contactor relays and power contactors in the SIRIUS family. It uses screw-type terminals for the auxiliary and control circuit connections, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or the AWG equivalents. This block carries a maximum thermal current of 10 A, but the real-world switching capacity depends on the circuit voltage and load type. At 24 V it switches 6 A (AC-15/DC-13 duty), while at 110 V the rating drops to 1 A. For 230 V circuits it handles 6 A, and at 400 V it is rated for 3 A. The AC-15 rating at 690 V is 1 A. These are not continuous ratings — they reflect the contact's ability to make and break inductive loads typical of contactor coils, solenoid valves, and small motor starters. ## Integration and environmental limits Snap-on mounting onto the contactor or relay — no DIN rail required, it clips directly onto the SIRIUS 3RH1 contactor family. Rated impulse withstand voltage is 6 kV, and the insulation voltage at pollution degree 3 is 690 V AC. These numbers place it firmly in standard industrial control panel duty — no special derating needed for most factory-floor environments.","metaTitle":"Siemens 3RH1911-1HA31 SIRIUS Auxiliary Switch Block, 3NO+1NC","metaDescription":"Siemens SIRIUS 3RH1911-1HA31 auxiliary switch block, 3 NO + 1 NC contacts, rated 10 A max. Phased-out; successor is 3RH2911-1HA31. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH1","Depth":"41.5 mm","Width":"36.5 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","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","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":"3","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at AC-15 at 690 V rated value":"1 A","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=401903&mlfb=3RH1911-1HA31","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1HA31/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH1911-1HA31 drop into a panel specified around 3RH2140-1BP40 without rewiring?","answer":"No. The 3RH2140-1BP40 is a 4-pole auxiliary contactor on the 3RH2 platform with a 45 mm width and 73 mm depth, versus the 3RH1911-1HA31 at 36.5 mm wide and 41.5 mm deep. The footprint and mounting interface differ, so a direct swap is not possible without panel rework."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1HA31","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/3RH1911-1HA31 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}}