{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1HA12","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1HA12","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1HA12","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1HA12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1HA12, 1 NO + 2 NC contacts, 10 A maximum, screw-type terminals, snap-on mounting for contactor relays and power contactors.","salesMarkdown":"The Siemens SIRIUS 3RH1911-1HA12 is a 4-pole auxiliary switch block with 1 normally open and 2 normally closed contacts, designed for snap-on mounting onto contactor relays and power contactors in the SIRIUS family. Rated for a maximum of 10 A, the switching current varies significantly with voltage: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, 3 A at 400 V, and 0.3 A at 220 V. At AC-15 duty up to 690 V it is rated at 1 A. The block uses screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG for auxiliary circuits. The 10 A maximum rating governs the resistive load curve; the voltage-specific ratings (6 A at 24 V, 3 A at 400 V, etc.) define the inductive switching capability at each control voltage level. For a 24 VDC control circuit, the 6 A rating is the one that determines whether this block handles the inrush of downstream contactor coils. Dimensions are 36.5 mm wide, 41.5 mm deep, and 37.5 mm high — a compact footprint that fits standard SIRIUS contactor relay envelopes without consuming additional DIN rail space.","metaTitle":"Siemens 3RH1911-1HA12 Auxiliary Switch Block, 10 A, SIRIUS","metaDescription":"Siemens SIRIUS 3RH1911-1HA12 auxiliary switch block, 1 NO + 2 NC, 10 A max, 690 V insulation. Phased-out; successor 3RH2911-1HA12. Sourced to order.","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":"1","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 (Operating 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=436610&mlfb=3RH1911-1HA12","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1HA12/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RH1911-1HA12?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — stock and lead time are confirmed at quote time."},{"question":"What is the difference between the 3RH1911-1HA12 and the 3RH2122-1WB40?","answer":"Both are SIRIUS auxiliary switch blocks, but the 3RH2122-1WB40 is a coupling relay with 2 NO + 2 NC contacts, a larger 45 mm width, and includes a built-in varistor surge suppressor. The 3RH1911-1HA12 is a 1 NO + 2 NC block with no integrated suppression and a narrower 36.5 mm footprint."},{"question":"What is the 3RH1911-1HA12 rated for at 400 V?","answer":"At 400 V the switching current rating is 3 A. The AC-15 rating at 690 V is 1 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1HA12","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/3RH1911-1HA12 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}}