{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1HA20-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1HA20-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1HA20-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1HA20-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, front-mount, 2 NO, 10 A max, screw-type terminals, snap-on mounting, for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"## Front-mount auxiliary switch for SIRIUS contactors The Siemens 3RH2911-1HA20-ZW97 is a front-mounted auxiliary switch block carrying 2 normally-open contacts, designed for the SIRIUS 3RT2 contactor and 3RH2 contactor relay family. It snaps onto the front of the device without tools, adding two NO signal paths for status feedback or interlocking in the control panel. Rated for a maximum of 10 A, the switch handles control-circuit loads across a wide voltage range: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, and 3 A at 400 V. The AC-15 rating at 690 V is 1 A, covering the typical pilot-duty switching in motor control centers. Mechanical service life is rated at 10 million switching cycles typical, with contact reliability of 1 faulty switching per 100 million operations at 17 V, 1 mA. That makes it suitable for high-cycling applications like conveyor interlock chains or valve position feedback where missed signals cause nuisance downtime. ## Snap-on integration and wiring Mounting is snap-on — no screws or DIN-rail adapter needed. The block clips directly onto the front of the base contactor or relay, occupying 36 mm width and 43.7 mm depth, with a height of 37.5 mm. Panel builders can plan the fill factor knowing each auxiliary block adds roughly the same footprint as the base device's front face. Wiring uses screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. The IP20 protection on the front means the terminals are finger-safe once installed inside an enclosure — standard for control-panel auxiliary contacts.","metaTitle":"Siemens 3RH2911-1HA20-ZW97 Auxiliary Switch, 2NO, 10A, SIRIU","metaDescription":"Siemens SIRIUS 3RH2911-1HA20-ZW97 auxiliary switch, 2 NO contacts, 10 A max, snap-on mount, screw terminals. Active production. Quoted 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 (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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b62436d0f7a6e35529360f7fb671b705.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=333874&mlfb=3RH2911-1HA20-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1HA20-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH2911-1HA20-ZW97?","answer":"The 3RH2122-1WB40 is a peer auxiliary contact block in the same SIRIUS family, but it carries 2 NO + 2 NC contacts versus the 2 NO only on this part. If your circuit needs both normally-open and normally-closed feedback, the 3RH2122-1WB40 covers that; if you only need two NO paths, the 3RH2911-1HA20-ZW97 is the correct fit."},{"question":"Where can I buy 3RH2911-1HA20-ZW97?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Submit a request for current pricing and lead time — availability is confirmed at quote time."},{"question":"What does the note 'with 3RH2' mean on this component?","answer":"It indicates the auxiliary switch is designed for use with the 3RH2 contactor relay series. It also fits 3RT2 power contactors, sharing the same front-mount interface."},{"question":"What is the depth of 3RH2911-1HA20-ZW97?","answer":"The depth is 43.7 mm, with a width of 36 mm and height of 37.5 mm. This is the installed dimension once snapped onto the contactor front."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1HA20-ZW97","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/3RH2911-1HA20-ZW97 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}}