{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA01","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA01","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH2911-4HA01, snap-on front mounting for contactor sizes S00, S0, S2, S3, ring terminal lug connection, rated 10 A AC-12, 6 kV surge voltage resistance.","salesMarkdown":"The Siemens 3RH2911-4HA01 is a SIRIUS auxiliary switch designed for snapping onto the front of contactor relays and power contactors in sizes S00, S0, S2, and S3. Contact reliability is 1 faulty switching per 100 million at 17 V and 1 mA. The ring terminal lug connection means wiring is done with crimped ring terminals, not spring-cage or screw-clamp — factor that into your panel wiring method and terminal strip planning. Rated operational current at AC-12 (resistive load) is 10 A maximum, and at AC-15 (inductive load typical of contactor coils) it's 1 A at 690 V — so this switch handles control-circuit isolation for the contactor itself, not motor power. The AC-15 current ratings across common control voltages are: 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 — these are the values that govern whether the auxiliary contacts can reliably switch the connected pilot devices or PLC inputs without welding. The mirror contact feature per IEC 60947-4-1 is critical for safety circuits: when used with 3RT2 contactors, the normally-closed mirror contact cannot remain closed if the main contacts weld, providing a reliable feedback path for the safety relay or PLC. Surge voltage resistance rated at 6 kV means the auxiliary switch withstands transient overvoltages typical of industrial control panels without flashover — important for maintaining isolation integrity in mixed-voltage cabinets. Specify the order code, confirm the contactor frame size (S00 through S3), and the snap-on front mount plus ring terminal connection are fixed. Snap-on mounting onto the front of the contactor means no DIN rail space is consumed — the auxiliary switch rides on the contactor itself, keeping the panel layout compact. Dimensions are 36 mm wide, 43.7 mm deep, 37.5 mm high — verify clearance in front of the contactor for the ring terminal wiring access, especially in dense panels. Operating temperature range is -25 to +60 °C, storage -55 to +80 °C — adequate for most indoor industrial control panels, but check if your enclosure ambient exceeds 60 °C near heat sources like drives or transformers.","metaTitle":"Siemens 3RH2911-4HA01 SIRIUS Auxiliary Switch, snap-on, 10A","metaDescription":"Siemens SIRIUS 3RH2911-4HA01 auxiliary switch for contactor sizes S00-S3. Snap-on front mount, ring terminal connection. Rated 10A AC-12, 6kV surge. Active production, sourced to o","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","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","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":"0","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6d1fa4653ff58db9bcd5ae0616611a19.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=335322&mlfb=3RH2911-4HA01","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA01/alternatives.json"},"ai":{"faq":[{"question":"What contactor sizes does this auxiliary switch fit?","answer":"It fits SIRIUS contactor sizes S00, S0, S2, and S3, covering a wide range of motor starter frames from small to medium."},{"question":"What is the contact reliability specification?","answer":"The auxiliary contacts are rated for 1 faulty switching per 100 million operations at 17 V and 1 mA, indicating very high reliability for dry switching of PLC inputs or low-energy signals."},{"question":"Does this switch have mirror contact functionality?","answer":"Yes, it is a mirror contact according to IEC 60947-4-1 when used with 3RT2 contactors, providing a mechanically linked normally-closed contact that reflects the main contact status for safety circuits."},{"question":"What type of electrical connection does it use?","answer":"It uses ring terminal lug connection for the auxiliary and control circuits, requiring crimped ring terminals rather than ferrules or bare wire under a screw clamp."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA01","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/3RH2911-4HA01 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}}