{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2NE21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2NE21","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2NE21","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NE21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2NE21, 2 NO + 1 NC, solid-state compatible, spring-loaded terminals, snap-on mounting for 3RT2 contactors.","salesMarkdown":"The Siemens SIRIUS 3RH2911-2NE21 is a front-mounted auxiliary switch block designed specifically for 3RT2.2/3/4 contactors and 3RH2 contactor relays. Its snap-on mounting clips directly onto the contactor front without tools, saving DIN-rail space compared to side-mount blocks. ## Contact configuration and solid-state compatibility The contact set is 2 NO + 1 NC, but with a critical distinction: one NO and one NC are designated solid-state compatible. That means those two contacts are rated for the low-energy switching typical of PLC outputs or solid-state relays — 5 V, 1 mA with a contact reliability of one incorrect switching per 100 million operations. The remaining NO contact handles standard pilot-duty loads. If you're mixing a PLC input with a conventional relay load on the same block, wire the low-level signal to the solid-state compatible pair. ## Electrical ratings and panel integration Rated insulation voltage is 690 V at pollution degree 3, with a surge voltage resistance of 6 kV — adequate for 400 V line-to-line industrial panels with clearance to 480 V systems. The spring-loaded terminals accept 2x (0.5 … 1.5 mm²) with ferrule or 2x (0.5 … 2.5 mm²) solid/stranded, matching the typical control-wire gauges in a motor control center. Mechanical service life is 5 million operating cycles typical.","metaTitle":"Siemens 3RH2911-2NE21 SIRIUS Auxiliary Switch, 2 NO + 1 NC,","metaDescription":"Siemens SIRIUS 3RH2911-2NE21 auxiliary switch block with 2 NO + 1 NC contacts, solid-state compatible, spring-loaded terminals. Snap-on for 3RT2 contactors. Active, available to or","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=554620&mlfb=3RH2911-2NE21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NE21/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'with 3RT2.2/3/4' mean?","answer":"It means this auxiliary switch block is designed to mount onto the front of Siemens 3RT2 contactors in frame sizes 2, 3, and 4. It snaps directly onto the contactor's front face without requiring additional DIN-rail space."},{"question":"What is the contact configuration of 3RH2911-2NE21?","answer":"The block provides 2 normally-open (NO) and 1 normally-closed (NC) contacts. One NO and one NC are solid-state compatible, rated for low-energy switching at 5 V, 1 mA with a contact reliability of one fault per 100 million operations."},{"question":"How do I get current pricing and availability for 3RH2911-2NE21?","answer":"Submit an RFQ through our site. We source this active Siemens part through independent distribution and confirm current pricing and lead time at quote time — availability and price change daily."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2NE21","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/3RH2911-2NE21 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}}