{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2FC22","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2FC22","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2FC22","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2FC22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2FC22, 2 NO + 2 NC, 10 A max, spring-loaded terminals, snap-on front mount for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"The Siemens 3RH2911-2FC22 is a front-mounted auxiliary switch block in the SIRIUS family, designed to snap onto 3RT2 power contactors and 3RH2 contactor relays. It provides 2 normally-open and 2 normally-closed contacts — the NO contacts are leading (close first), the NC contacts are lagging (open last), which matters when sequencing control signals during contactor pick-up and drop-out. The leading/lagging arrangement prevents momentary bridging between NO and NC circuits on the same contactor. Rated for a maximum of 10 A, with AC-15 utilization at 690 V carrying 1 A. Snap-on mounting means it clips directly to the contactor front without tools, occupying a 36 mm wide footprint and projecting 47.7 mm forward from the contactor face. The spring-loaded terminals accept 2x 0.5–2.5 mm² stranded without ferrules, or 2x 0.5–1.5 mm² with ferruled ends — no screwdriver needed for termination, which speeds panel wiring. ## Switching capacity across voltage ranges For DC switching at 24 V, the contacts handle 6 A; at 60 V, 2 A; at 110 V, 1 A; at 220 V, 0.3 A. For AC loads at 230/250 V, the rating is 6 A; at 400 V, 3 A. These derating curves reflect arc extinction limits — a buyer selecting this block for a 24 VDC pilot circuit gets full 6 A capacity, but the same block on a 220 VDC solenoid drops to 0.3 A. A second set of rated values (likely at a different duty cycle or temperature) shows 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. The higher 24 V figure matches the 10 A maximum, but the 60 V and 110 V figures are lower than the first set — the lower numbers likely apply at elevated ambient temperature or higher switching frequency. Always verify the specific duty cycle for your application. For a critical spare holding on a line using 3RT2 contactors, this block is the correct front-mounted auxiliary. The spring-loaded terminal version (2FC22 suffix) is the tool-less wiring variant — if your existing install uses screw terminals, the 2FC22 is a direct mechanical fit but requires a different termination method. Ordering the spring-clamp version for a screw-terminal panel is fine; just ensure your wire ferrules or solid conductors match the 0.5–2.5 mm² range. Surge voltage resistance is rated at 6 kV, and insulation voltage at 690 V AC with pollution degree 3.","metaTitle":"Siemens 3RH2911-2FC22 Auxiliary Switch, 2NO+2NC, 10A, Spring","metaDescription":"Siemens SIRIUS 3RH2911-2FC22 auxiliary switch block, 2 NO + 2 NC contacts rated 10 A max. Snap-on front mount for 3RT2 contactors and 3RH2 relays. Spring-loaded terminals, IP20 fro","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","Maximum":"10 A","at 24 V":"6 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"6 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"6 A","at 400 V":"3 A","During Storage":"-55 ... +80 °C","Leading Contact":"2","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"2","Product Brand Name":"SIRIUS","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","Instantaneous Contact":"0","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 2.5 mm²)","at AC-15 at 690 V rated value":"1 A","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","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"}},"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=80728&mlfb=3RH2911-2FC22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2FC22/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RH2911-2FC22 used for?","answer":"It is a front-mounted auxiliary switch block for Siemens SIRIUS 3RT2 power contactors and 3RH2 contactor relays. It adds 2 normally-open and 2 normally-closed auxiliary contacts with spring-loaded terminals for tool-less wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2FC22","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/3RH2911-2FC22 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}}