{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA12","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA12","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA12","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4HA12 auxiliary switch, 1 NO + 0 NC, snap-on front mount, ring terminal lug connection, 10 A at 24 V, for contactor sizes S00/S0/S2/S3.","salesMarkdown":"## Auxiliary switch for SIRIUS contactors — what the ratings mean The 3RH2911-4HA12 is a SIRIUS auxiliary switch designed for snapping onto the front of Siemens contactor relays and power contactors in frame sizes S00, S0, S2, and S3. It provides one instantaneous normally-open contact (1 NO) with no leading or lagging switching contacts. For AC-15 duty at 690 V, the rated current is 1 A. ## Mechanical and environmental limits The switch snaps onto the front of the contactor without additional fasteners; the mounting method matches the SIRIUS system for tool-less assembly. Dimensions are 36 mm wide, 43.7 mm deep, and 37.5 mm high. Front protection class is IP00 — the switch relies on the panel enclosure for environmental sealing. Surge voltage resistance is rated at 6 kV. Mechanical service life is 10 million operating cycles typical. The auxiliary and control circuit connection uses ring terminal lugs — confirm the lug size and torque spec from the contactor's wiring diagram before termination. ## Mirror contact compliance and documentation The switch provides a mirror contact per IEC 60947-4-1 when used with 3RT2 contactors — a safety-critical feature that ensures the normally-closed contact cannot close if the main contacts are welded, supporting fail-safe disconnection in safety circuits. Substance prohibitance date is 10/01/2009, indicating RoHS compliance under the EU directive.","metaTitle":"Siemens 3RH2911-4HA12 SIRIUS Auxiliary Switch, 10 A at 24 V","metaDescription":"Siemens 3RH2911-4HA12 SIRIUS auxiliary switch, 10 A rated at 24 V, snap-on mount for contactors S00-S3. Active production. Quoted 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","title":"3RH2911-4HA12","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, 1 NO + 2 NC,.1/.2,.1/.2,.3/.4, --/--, current path: 1 NC, 1 NC, 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":"1","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/e11bb73a87ce47ca0f2bd122ce3fc2c6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=445342&mlfb=3RH2911-4HA12"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA12","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/3RH2911-4HA12 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}}