{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2NF20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2NF20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2NF20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NF20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2NF20, 2 NO solid-state-compatible contacts, spring-loaded terminals, snap-on for 3RT2.2/3/4 contactors, IP20, 690 V insulation.","salesMarkdown":"The Siemens SIRIUS 3RH2911-2NF20 is an auxiliary switch block designed to snap onto the front of 3RT2.2/3/4 contactors and 3RH2 contactor relays. It adds two normally-open (NO) auxiliary contacts that are explicitly rated as solid-state compatible — meaning they handle the low-energy switching demands of PLC inputs and electronic control modules without the contact wetting issues standard silver-cadmium contacts can exhibit at milliampere levels. ## Contact reliability and switching performance The solid-state-compatible NO contacts are rated for one incorrect switching operation per 100 million cycles at 5 V, 1 mA — a figure that tells you these contacts are designed for the dry-switching environment of a digital input card, not just power contactor mirror contacts. Spring-loaded terminals accept 2x (0.5... 1.5 mm²) with ferrule or 2x (0.5... 2.5 mm²) solid/stranded without. AWG equivalent is 2x (20... 14). The 47.7 mm depth, 36 mm width, and 41.5 mm height keep the block within the contactor's own envelope — no extra DIN-rail space consumed. Snap-on mounting onto the contactor front means no tools for installation or removal; the block clips into the same slots as the standard auxiliary switch. ## Environmental and electrical ratings Front protection is IP20 — finger-safe from the front, but the contactor body itself provides the enclosure-level IP rating. The block carries no leading or lagging contact timing (both are 0), so all NO contacts close simultaneously.","metaTitle":"Siemens 3RH2911-2NF20 SIRIUS Auxiliary Switch, 2 NO, Spring-","metaDescription":"Siemens SIRIUS 3RH2911-2NF20 auxiliary switch block with 2 solid-state-compatible NO contacts, spring-loaded terminals, 690 V insulation, IP20. Snap-on for 3RT2 contactors. Active","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT2.2/3/4","Depth":"47.7 mm","Width":"36 mm","Height":"41.5 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"0","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","Instantaneous Contact":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","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":"https://cdn.aoctrl.com/f259df36341454edc6a58d6c614a26fc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=394006&mlfb=3RH2911-2NF20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NF20/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'with 3RT2.2/3/4' mean for 3RH2911-2NF20?","answer":"It means this auxiliary switch block is designed to snap onto the front of Siemens 3RT2 contactors in frame sizes 2, 3, and 4 — it is not a standalone DIN-rail component."},{"question":"What is the depth of 3RH2911-2NF20?","answer":"The depth is 47.7 mm, which keeps the switch block within the contactor's own depth envelope."},{"question":"How do I get current pricing and availability for 3RH2911-2NF20?","answer":"Submit an RFQ through this listing; the part is sourced to order through independent distribution, and current pricing and availability are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RH2911-2NF20?","answer":"The part carries the SIRIUS brand and is designed to IEC/EN 60947-5-1 standards. Specific RoHS, REACH, and UL documentation is available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2NF20","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/3RH2911-2NF20 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}}