{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4FB22","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4FB22","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4FB22","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FB22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4FB22 auxiliary switch, snap-on front mounting for contactor sizes S00, S0, S2, S3, 10 A AC-12, ring terminal lug connection.","salesMarkdown":"The Siemens SIRIUS 3RH2911-4FB22 is an auxiliary switch block that snaps onto the front of SIRIUS contactors in frame sizes S00, S0, S2, and S3. It provides one normally-open instantaneous contact and one normally-closed lagging contact, with a leading contact also present. The ring terminal lug connection suits panel wiring where secure, vibration-resistant terminations are preferred over cage clamps. ## Ratings that matter for the panel builder The AC-12 rated operational current is 10 A maximum, which covers most control-circuit loads like PLC inputs, relay coils, and indicator lamps. For inductive AC-15 duty at 690 V it is rated 1 A — the figure to use when switching contactor coils or solenoid valves on a 690 V control transformer. The DC switching table is detailed: 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 switch holds its arc on a DC inductive load; the 24 V 6 A rating is typical for a 24 VDC control bus feeding multiple small relays. Snap-on mounting to the contactor front means no DIN-rail space is consumed — the switch rides on the contactor itself. Dimensions are 36 mm wide, 37.5 mm high, and 43.7 mm deep, so it protrudes about 44 mm forward of the contactor face. The front protection class is IP00, so it relies on the enclosure for dust and moisture protection. The switch is not a mirror contact per IEC 60947-4-1, so it should not be used as the sole feedback for safety-related contactor weld monitoring in a safety circuit.","metaTitle":"Siemens 3RH2911-4FB22 SIRIUS Auxiliary Switch, 10 A AC-12, s","metaDescription":"Siemens SIRIUS 3RH2911-4FB22 auxiliary switch, 10 A AC-12 rated, snap-on mounting for S00-S3 contactors. Current production. Ring terminal connection. 43.7 mm depth.","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":"1","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Category":"Auxiliary switch","Lagging Switching":"1","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":"1","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":"No","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=81447&mlfb=3RH2911-4FB22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4FB22/alternatives.json"},"ai":{"faq":[{"question":"What contactor sizes does this auxiliary switch fit?","answer":"It snaps onto the front of SIRIUS contactors in frame sizes S00, S0, S2, and S3."},{"question":"What is the DC switching capacity at 24 V?","answer":"It is rated 6 A at 24 V DC. The full DC table covers 24 V through 600 V."},{"question":"What type of connection does it use?","answer":"Ring terminal lug connection, suitable for secure screw-terminated wiring in control panels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4FB22","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/3RH2911-4FB22 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}}