{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2HA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2HA20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2HA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2HA20, 2 NO instantaneous contacts, snap-on front mounting for contactor sizes S00, S0, S2, S3, rated 6 A at 24 V, IP20 front.","salesMarkdown":"The Siemens 3RH2911-2HA20 is a SIRIUS auxiliary switch block that snaps onto the front of contactor relays and power contactors in frame sizes S00, S0, S2, and S3. It carries two instantaneous normally-open contacts — no leading or lagging delay built in. This is the part you add when the main contactor needs to signal its position back to a PLC, light a panel indicator, or interlock another device in the circuit. Snap-on mounting means it clips directly onto the front of the contactor — no tools, no DIN rail. Dimensions are 36 mm wide, 47.7 mm deep, 41.5 mm tall. The IP20 protection on the front is standard for enclosed panels; keep the panel door closed during operation. Wiring accepts 2x (0.5 to 2.5 mm²) solid or stranded, or 2x (20 to 14 AWG). Finely stranded with ferrule goes up to 1.5 mm². Strip length and screw torque follow the standard SIRIUS practice — the spring-cage terminal is the same as the 3RT2 contactor family. ## Compliance and reliability The auxiliary contacts are mirror contacts per IEC 60947-4-1 when used with 3RT2 contactors — meaning if a welded contact is detected, the mirror contact's state is guaranteed to reflect the main contact position, a safety requirement for certain isolation circuits. RoHS compliance date is noted as October 1, 2009.","metaTitle":"Siemens 3RH2911-2HA20 SIRIUS Auxiliary Switch, 2 NO, snap-on","metaDescription":"Siemens 3RH2911-2HA20 SIRIUS auxiliary switch block, 2 instantaneous NO contacts, snap-on mounting for S00-S3 contactors. Rated 6 A at 24 V, IP20 front. Active production, sourced","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"47.7 mm","Width":"36 mm","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","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":"2","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":"$4.31","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=334285&mlfb=3RH2911-2HA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA20/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2911-2HA20 drop into a panel that was specified around 3RH2122-2AV60 without rewiring?","answer":"Both are SIRIUS auxiliary switch blocks that snap onto the front of S00–S3 contactors, so the mechanical fit is the same. The 3RH2911-2HA20 carries 2 NO contacts; the 3RH2122-2AV60 carries 2 NO + 2 NC. If your panel wiring expects the NC contacts, you would need to rewire or add a second block. Check your schematic for the contact count before swapping."},{"question":"What compliance documentation does this brand provide for 3RH2911-2HA20 (RoHS, REACH, UL, IEC)?","answer":"The part carries a RoHS compliance date of October 1, 2009. The mirror contact function is certified per IEC 60947-4-1. Standard Siemens SIRIUS documentation includes a CE declaration and UL/CSA recognition files — these are available through the Siemens Industry Online Support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2HA20","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/3RH2911-2HA20 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}}