{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2HA11","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2HA11","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2HA11","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-2HA11 auxiliary switch, 1 NO contact, 10 A at 24 V, snap-on mounting for contactor sizes S00, S0, S2, S3, IP20 front, 47.7 x 36 x 41.5 mm.","salesMarkdown":"## What this switch does on a contactor The 3RH2911-2HA11 is a SIRIUS auxiliary switch block with one normally-open (NO) instantaneous contact, designed to snap onto the front of Siemens contactor relays and power contactors in sizes S00, S0, S2, and S3. It adds a signalling or interlocking contact that mirrors the main contactor's state — useful for feedback to a PLC, status lamp, or safety circuit. The mirror contact function per IEC 60947-4-1 is supported when used with 3RT2 contactors, meaning the NO contact cannot close if the main contacts are welded — a critical feature for safety-related isolation. ## Contact ratings and what they mean for your circuit Rated 10 A at 24 V and 6 A at 230 V — the higher current at low voltage suits DC control circuits common in PLC outputs; the 230 V rating covers standard AC pilot duty. For DC loads at higher voltages, the current drops: 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V and 250 V. AC ratings at 400 V and 440 V are 3 A and 0.5 A respectively — the 400 V figure covers 3-phase control circuits in European panels. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA — that's the low-energy threshold where oxide films on silver contacts can cause intermittence; this switch is designed to wet through at those levels. ## Mounting and panel fit Snap-on mounting means it clips directly onto the contactor's front without tools — no DIN rail footprint needed for the switch itself, but the contactor is DIN-rail mounted. Dimensions: 47.7 mm deep, 36 mm wide, 41.5 mm high — the width matches the S00/S0 contactor face, so it doesn't overhang and crowd adjacent devices. IP20 front protection means finger-safe against accidental contact, but the switch is not sealed — keep it inside the panel enclosure, not in a washdown zone. ## Wiring and termination Accepts 2 x 0.5–2.5 mm² solid or stranded wire, or 2 x 20–14 AWG — the dual-wire terminals let you daisy-chain the control common without a separate terminal block. For finely stranded wire with ferrules, the range is 2 x 0.5–1.5 mm²; without ferrules, 2 x 0.5–2.5 mm². Surge voltage resistance rated at 6 kV — this switch can handle transient spikes on long control wiring without flashover, matching IEC 60947-5-1 requirements. ## Lifecycle and compliance Listed as current production — this is a standard active SIRIUS accessory, not a legacy or phase-out item. RoHS compliance date marked as 10/01/2009 — the switch meets EU RoHS requirements since that date. Operating temperature range -25 to +60 °C; storage -55 to +80 °C — suitable for most industrial panel environments including unheated warehouses.","metaTitle":"Siemens 3RH2911-2HA11 SIRIUS Auxiliary Switch, 1 NO, 10 A","metaDescription":"Siemens 3RH2911-2HA11 SIRIUS auxiliary switch, 1 NO contact, rated 10 A at 24 V, IP20 front. Snap-on for S00–S3 contactors. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"47.7 mm","Width":"36 mm","title":"3RH2911-2HA11","Height":"41.5 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 + 1 NC,.1/.2,.3/.4, --/--, --/--, current path: 1 NC, 1 NO, --, --, spring-loaded terminal, 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","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","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":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","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","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ba7c064a89d0a8e77e36f7a7dd989860.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=377776&mlfb=3RH2911-2HA11"},"ai":{"faq":[{"question":"What are the contact ratings for 3RH2911-2HA11 at different voltages?","answer":"The NO contact is rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 250 V DC. Full AC and DC ratings are listed in the spec table above."},{"question":"Does 3RH2911-2HA11 fit S00, S0, S2, and S3 contactors?","answer":"Yes, it is designed for contactor sizes S00, S0, S2, and S3. It snaps onto the front of the contactor."},{"question":"What compliance documentation does Siemens provide for 3RH2911-2HA11?","answer":"RoHS compliance is marked with a substance prohibitance date of 10/01/2009. The switch also carries IP20 front protection and surge voltage resistance of 6 kV."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2HA11","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/3RH2911-2HA11 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}}