{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1LA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1LA20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1LA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1LA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary switch block, front-mounted, 2 NO, screw terminals, 10 A max, for 3RT2/3RH2 contactors.","salesMarkdown":"The Siemens 3RH2911-1LA20 is a front-mounted auxiliary switch block for the SIRIUS contactor family, specifically designed to snap onto 3RT2 power contactors and 3RH2 contactor relays. It adds two normally-open (NO) auxiliary contacts — wired as terminals 73/74 and 83/84 — with screw-type terminations and top cable entry. The real-world switching capacity depends on the voltage and duty: at 24 V it's rated 6 A in AC-15, at 110 V it drops to 1 A, and at 690 V AC-15 it's still good for 1 A. That 690 V figure matters for panels running 690 V line supplies — common in heavy industrial and mining installations. The mechanical life is 10 million cycles, so this block outlasts most contactor bodies it rides on. Snap-on mounting to the contactor front face — no tools needed, no DIN rail space consumed. The block measures 36 mm wide by 37.5 mm tall by 43.7 mm deep, which keeps the overall contactor-plus-block envelope compact for dense panel layouts. Wiring acceptance: screw terminals take 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or 2x (20 to 16 AWG) and 2x (18 to 14 AWG) for stranded. IP20 on the front face means finger-safe when installed in a closed panel — standard for control cabinets. ## Current ratings by voltage — the full picture The block carries two sets of current ratings: one for general switching and one for AC-15 duty (solenoid/contactor coil loads). For general use: 10 A at 24 V, 6 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 3 A at 400 V. For AC-15 at 690 V, it's rated 1 A — that's the inductive load curve for pilot duty. That PD3 rating means it's suitable for the conductive environment inside an industrial control panel without conformal coating.","metaTitle":"Siemens 3RH2911-1LA20 SIRIUS Auxiliary Switch, 2 NO, 10 A","metaDescription":"Siemens SIRIUS 3RH2911-1LA20 auxiliary switch block, 2 NO contacts, rated 10 A max. Snap-on front mount 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":{"Note":"with 3RH2","Depth":"43.7 mm","Width":"36 mm","Height":"37.5 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":"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","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":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 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 ... 16), 2x (18 ... 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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.69","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/649b2a4bc4d394789a47fa25746fe0e2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=305103&mlfb=3RH2911-1LA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1LA20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RH2422-1AB00?","answer":"The 3RH2422-1AB00 is a different form factor — it's a complete contactor relay, not an add-on switch block. The 3RH2911-1LA20 is a front-mount accessory for 3RT2/3RH2 bases, so it won't drop into a panel wired for the 3RH2422 without changing the base contactor. For a direct functional swap within the same contactor frame, stick with the 3RH2911-1LA20."},{"question":"What does the note 'with 3RH2' mean?","answer":"It means this auxiliary switch block is designed to mount on 3RH2 contactor relays, in addition to 3RT2 power contactors. The same block fits both families."},{"question":"What is the depth of this component?","answer":"43.7 mm, measured from the contactor mounting face to the rear of the switch block."},{"question":"What compliance documentation is available?","answer":"The SIRIUS series carries standard Siemens declarations for CE, RoHS, and REACH. Specific UL/CSA file numbers are part of the contactor assembly listing — this block is covered under the same certification as the base 3RT2/3RH2 device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1LA20","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/3RH2911-1LA20 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}}