{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2FB22-0MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2FB22-0MA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2FB22-0MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2FB22-0MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 2 NO + 2 NC, 10 A maximum, spring-loaded terminals, snap-on mounting for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"## What this block does in a panel The 3RH2911-2FB22-0MA0: This is the front-mounted auxiliary switch block for SIRIUS contactors and contactor relays — specifically the 3RT2 and 3RH2 families. It snaps onto the front of the device (no tools, no DIN-rail space) and gives you four contacts: two normally open, two normally closed, with one NO leading and one NC lagging. The spring-loaded terminals accept 2x (0.5 to 1.5 mm²) with ferrule or 2x (0.5 to 2.5 mm²) solid, plus AWG 20–14. Rated for 10 A maximum, with a contact reliability of 1 faulty switching per 100 million operations at 17 V, 1 mA. ## Current ratings — what the voltages mean for your circuit The 10 A maximum is the thermal current (Ith); the actual switching capacity depends on voltage and load type. At 24 V the block switches 6 A (AC-15 at 690 V is rated 1 A). For DC circuits the derating is steeper: 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. The AC-15 rating at 690 V is 1 A — that's the inductive load curve for contactor coils and solenoids. If you're switching a 24 VDC pilot light or PLC output, the 6 A at 24 V gives plenty of headroom; for a 220 VDC brake coil, the 0.3 A limit means you need to check the inrush. ## Mounting and wiring reality Snap-on mounting means it clips directly onto the contactor or relay front — no DIN rail, no screws. The block is 36 mm wide, 47.7 mm deep, 41.5 mm high. Spring-loaded terminals: strip 8 mm, push the wire in. The terminal layout is marked on the block: 11 U, 53/54, 61/62, 75/76, 87/88. One NO is a leading contact (closes before the main contacts), one NC is lagging (opens after).","metaTitle":"Siemens 3RH2911-2FB22-0MA0 SIRIUS Auxiliary Switch, 10 A, Sp","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH2911-2FB22-0MA0, 2 NO + 2 NC, 10 A max, spring-loaded terminals, snap-on for 3RT2/3RH2 contactors. Active production. Sourced to order.","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":"1","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"1","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":"1","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 (Switching 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=1201121&mlfb=3RH2911-2FB22-0MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2FB22-0MA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2911-2FB22-0MA0 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the depth of 3RH2911-2FB22-0MA0?","answer":"The block is 47.7 mm deep, 36 mm wide, and 41.5 mm high."},{"question":"Will 3RH2911-2FB22-0MA0 drop into a panel specified for 3RH2122-2BG40?","answer":"Both are front-mounted auxiliary switch blocks for Siemens SIRIUS contactors, but the contact configuration differs. The 3RH2911-2FB22-0MA0 carries 2 NO + 2 NC with one leading and one lagging contact; verify your circuit's contact sequence before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2FB22-0MA0","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/3RH2911-2FB22-0MA0 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}}