{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA22","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA22","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA22","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH2911-4HA22, 2 NO instantaneous contacts, snap-on mounting for contactor sizes S00, S0, S2, S3, ring terminal lug connection, IP00 front.","salesMarkdown":"The Siemens 3RH2911-4HA22 is a SIRIUS auxiliary switch block with two normally-open instantaneous contacts, designed to snap onto the front of contactor relays and power contactors in sizes S00, S0, S2, and S3. The 6 kV surge voltage resistance means it handles transient spikes common on industrial control circuits without failing. ## Switching capacity — what the voltage columns mean This block carries two sets of current ratings: the 'at X V' values (–) are the rated operational current for that voltage under the applicable utilization category, and the 'at X V rated value' entries (–) are the maximum thermal current at those voltages. At 24 V it switches 6 A with a rated thermal current of 10 A; at 230 V it still handles 6 A. At higher voltages the current drops — 3 A at 400 V, 0.26 A at 600 V. For AC-12 resistive loads the max is 10 A; for AC-15 at 690 V it's 1 A. That means for a typical 24 VDC control circuit you have headroom to 6 A, but if you're switching a 400 VAC pilot light the contact rating drops to 3 A. The mirror contact feature, compliant with IEC 60947-4-1, is only guaranteed when paired with a 3RT2 contactor — important for safety circuits where you need to verify the main contact state. Dimensions: 36 mm wide, 43.7 mm deep, 37.5 mm tall. The snap-on mounting clips directly onto the contactor front without tools — no DIN rail required. The ring terminal lug connection means you'll need crimp ring terminals; no cage clamp or screw-cage here. The IP00 front means no ingress protection — keep it inside a sealed enclosure if there's dust or moisture.","metaTitle":"Siemens 3RH2911-4HA22 SIRIUS Auxiliary Switch, 2 NO, snap-on","metaDescription":"Siemens 3RH2911-4HA22 SIRIUS auxiliary switch, 2 NO contacts, snap-on for S00-S3 contactors. 6 A at 24 V, 10 A AC-12 max. Ring terminal connection. Current lifecycle. Sourced to or","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":"2","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":"$8.38","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=231089&mlfb=3RH2911-4HA22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA22/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2911-4HA22 drop into a panel specified around 3RH2122-1BA40 without rewiring?","answer":"The 3RH2911-4HA22 uses ring terminal lug connections, while the 3RH2122-1BA40 uses screw-type terminals. If your panel is wired for screw-clamp terminals, the 3RH2122-1BA40 drops in without rewiring; the 3RH2911-4HA22 would require changing to ring terminals. Both snap onto the same contactor sizes S00, S0, S2, S3 and share the same 2 NO contact count."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA22","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/3RH2911-4HA22 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}}