{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1DA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1DA20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1DA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1DA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1DA20 auxiliary switch, lateral mount, 2 NO contacts, 10 A, screw-type terminals, for 3RT2 contactors.","salesMarkdown":"## Lateral auxiliary switch for 3RT2 contactors The 3RH2911-1DA20 is a lateral-mounted auxiliary switch block from the Siemens SIRIUS family, designed to snap onto the left or right side of a 3RT2 contactor. It adds two normally-open (NO) auxiliary contacts — terminals 43/44 and 53/54 on the left side, or 23/24 and 33/34 on the right — giving the contactor feedback or interlocking capability without extra wiring space. ## Current ratings across duty and voltage The contact rating is 10 A maximum, but the usable current depends on the switching voltage and duty. At 24 V it handles 6 A in one duty class and 10 A in another — the difference reflects AC vs DC or resistive vs inductive load capability. For AC-15 pilot duty at 690 V it is rated 1 A, which covers most PLC input and relay coil switching in 480 V panels. At higher DC voltages the current drops sharply: 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. This matters when the auxiliary switch is used to break DC control circuits — the arc extinguishes differently than AC, so the derating is real and must be factored into the BOM. ## Mechanical life and contact reliability Rated for 10 million mechanical switching cycles typical, with a contact reliability of one faulty switching per 100 million operations at 17 V, 1 mA. That means the contacts are reliable down to low-level signals — useful for direct PLC input sensing without a separate interface relay. ## Insulation coordination and environmental limits Rated insulation voltage is 690 V AC at pollution degree 3, with a surge voltage resistance of 6 kV. This puts it in the same insulation class as the contactor it mounts to — no derating needed for standard 480 V motor control panels. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. ## Mounting and connection details Snap-on mounting to the contactor — no DIN rail required for the auxiliary block itself. Dimensions are 10 mm wide, 57.4 mm high, 66 mm deep. Screw-type terminals accept 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 wire. IP20 protection on the front face.","metaTitle":"Siemens 3RH2911-1DA20 SIRIUS Auxiliary Switch, 10 A, 2 NO","metaDescription":"Siemens 3RH2911-1DA20 SIRIUS auxiliary switch, lateral mount, 2 NO contacts, rated 10 A, screw terminals. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT2","Depth":"66 mm","Width":"10 mm","Height":"57.4 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 (Switching 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":"$6.48","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/787be1cd701611d25ec2733f1e65e5bf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=172231&mlfb=3RH2911-1DA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1DA20/alternatives.json"},"ai":{"faq":[{"question":"How can I order 3RH2911-1DA20 and check pricing?","answer":"The 3RH2911-1DA20 is sourced to order against your BOM through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time with full manufacturer traceability."},{"question":"What does the note 'with 3RT2' mean for 3RH2911-1DA20?","answer":"The note indicates this auxiliary switch is designed to mount laterally on Siemens 3RT2 contactors. It snaps onto either side of the contactor and adds two NO auxiliary contacts without requiring additional DIN-rail space."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1DA20","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/3RH2911-1DA20 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}}