{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1HA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1HA20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1HA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1HA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1HA20 auxiliary switch, 2 NO instantaneous contacts, snap-on mounting for contactor sizes S00 through S3, rated 6 A at 24 V, IP20 front protection.","salesMarkdown":"The 3RH2911-1HA20 is a SIRIUS auxiliary switch block that snaps onto the front of Siemens contactor relays and power contactors in sizes S00, S0, S2, and S3. It carries two normally-open instantaneous contacts — no delayed or lagging contacts here, just clean make/break on coil pickup. The 6 A rating at 24 V is the AC-15 pilot-duty current for solenoid loads — think PLC outputs, relay coils, or indicator lamps. That derating curve matters when you're switching a bank of contactor coils at a higher control voltage. For dry-circuit signal switching, this block is built to avoid that failure mode. ## Snap-on fit and panel wiring Mounting is tool-free: the block snaps directly onto the front of the contactor or contactor relay. The 36 mm width and 43.7 mm depth keep it within the contactor's own envelope — no extra DIN rail space needed beyond the base device. For AWG, that's 2x (20…16) or 2x (18…14). The screw clamps are captive, so no dropped hardware inside the panel. Front IP20 means finger-safe when mounted on the contactor — no shock hazard during troubleshooting with the panel door open. ## Mirror contact and safety circuit use The 3RH2911-1HA20 is listed as a mirror contact per IEC 60947-4-1 when used with the 3RT2 contactor series. That means the NC mirror contact mechanically reflects the main contact position — critical for safety circuits where you need positive confirmation that the main power contacts have opened before allowing access to the guarded zone. Surge voltage resistance is rated at 6 kV, which covers the impulse withstand for most industrial control panels per IEC 60947-1 overvoltage category III. Current pricing and lead time confirmed at RFQ — no stock-holding claim here, but it's a standard production part with no supply constraints flagged.","metaTitle":"Siemens 3RH2911-1HA20 SIRIUS Auxiliary Switch, 2 NO contacts","metaDescription":"Siemens 3RH2911-1HA20 SIRIUS auxiliary switch, 2 NO instantaneous contacts, 6 A at 24 V. Snap-on mounting for S00-S3 contactors.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1HA20","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, 2 NO,.3/.4,.3/.4, --/--, --/--, current path: 1 NO, 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":"2","Substance Prohibitance (Date)":"10/01/2009","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","for 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":"$4.41","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/dfd09ea7c205fdc1d8e656a0cca81919.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=392565&mlfb=3RH2911-1HA20"},"ai":{"faq":[{"question":"What is the 3RH2911-1HA20 used for?","answer":"It's a snap-on auxiliary switch block for Siemens SIRIUS contactors and contactor relays in sizes S00, S0, S2, and S3. It adds two NO instantaneous contacts to the base device for status feedback, interlocking, or pilot-duty control circuits."},{"question":"Does the 3RH2911-1HA20 have a mirror contact?","answer":"Yes, it's a mirror contact per IEC 60947-4-1 when used with the 3RT2 contactor series. This is important for safety circuits where the NC contact must positively reflect the main contact position."},{"question":"What compliance documentation does Siemens provide for the 3RH2911-1HA20?","answer":"The part carries a substance prohibition date of 10/01/2009, indicating RoHS compliance. It also has a 6 kV surge voltage resistance rating per IEC 60947-1. For specific UL, CSA, or other agency file numbers, the datasheet or Siemens support should be consulted."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1HA20","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/3RH2911-1HA20 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}}