{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1HA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1HA10","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1HA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1HA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1HA10 auxiliary switch, 1 normally open (NO) instantaneous contact, snap-on mounting for contactor sizes S00, S0, S2, S3, IP20 front protection.","salesMarkdown":"## What it is and where it fits The 3RH2911-1HA10 is a Siemens SIRIUS auxiliary switch block — one normally open (NO) instantaneous contact that snaps onto the front of a contactor or contactor relay. It's designed for contactor sizes S00, S0, S2, and S3, meaning it covers the small to mid-frame SIRIUS power contactor and relay range. Use it to add a feedback or interlock contact to a 3RT2 contactor (or similar SIRIUS frame) without extra wiring space — the snap-on mount keeps the assembly within the contactor's own footprint. IP20 on the front means it's safe for finger contact inside an enclosure but not for washdown environments. ## Rated currents and what they mean for your circuit The contact carries 10 A at 24 V (rated value) and 6 A at 24 V under the auxiliary contact rating — the 10 A figure is the thermal continuous current, while the 6 A is the switching capacity in AC-15 duty at that voltage. At higher voltages the current drops: 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. This lets you size the contact for the specific control voltage in your panel. For DC switching, the ratings are lower: 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V and 250 V, and 3 A at 400 V. The DC arc extinction is inherently harder, so these limits are what the contact can reliably break without welding. Contact reliability is rated at 1 faulty switching per 100 million operations at 17 V, 1 mA — this is the low-energy switching spec that matters for PLC inputs or solid-state loads where a dry circuit needs a reliable closure. The surge voltage resistance is 6 kV, giving the insulation system margin against transient spikes on the control bus. ## Mounting and wiring in the panel Snap-on mounting means no screws or tools for installation — the block clips onto the contactor front. The dimensions are compact: 36 mm wide, 43.7 mm deep, 37.5 mm high, so it adds negligible depth to the contactor assembly. This is critical when the panel depth is tight against the backplate or enclosure door. Wiring accepts 2x (0.5... 1.5 mm²) solid or stranded, or 2x (0.75... 2.5 mm²) fine-stranded with ferrules — the dual-wire termination saves a jumper when daisy-chaining the common. AWG equivalents are 2x (20... 16) and 2x (18... 14). Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. ## Lifecycle and compliance RoHS compliance date is 10/01/2009, so the part meets the EU Restriction of Hazardous Substances directive. No UL/CSA listing is explicitly recorded in the spec data, but the IEC ratings (AC-15 at 690 V rated 1 A) and surge voltage rating (6 kV) indicate compliance with IEC 60947-5-1 for control circuit devices.","metaTitle":"Siemens 3RH2911-1HA10 SIRIUS Auxiliary Switch, 1 NO Contact","metaDescription":"Siemens 3RH2911-1HA10 SIRIUS auxiliary switch, 1 NO, snap-on for S00-S3 contactors. Rated 10 A at 24 V, IP20. Current production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1HA10","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,.3/.4, --/--, --/--, --/--, current path: 1 NO, --, --, --, screw 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 ... 1.5 mm²), 2x (0.75 ... 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 ... 16), 2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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","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":"screw-type 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":"$3.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/392bf50e1766b1749e86ce772ab608c4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137576&mlfb=3RH2911-1HA10"},"ai":{"faq":[{"question":"What contactor sizes does 3RH2911-1HA10 fit?","answer":"It snaps onto SIRIUS contactors and contactor relays in sizes S00, S0, S2, and S3. This covers the 3RT1 and 3RT2 families from the smallest frame up through the 65 A (AC-3) class."},{"question":"What compliance documentation does Siemens provide for 3RH2911-1HA10?","answer":"The part carries an RoHS compliance date of 10/01/2009. It is designed to IEC 60947-5-1 for control circuit devices, with a surge voltage resistance of 6 kV and mirror contact compliance per IEC 60947-4-1 when used with 3RT2 contactors. No UL/CSA file number is listed in the spec data."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1HA10","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/3RH2911-1HA10 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}}