{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2HA20-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2HA20-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2HA20-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA20-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2HA20-ZW97, 2 NO contacts, spring-loaded terminals, snap-on mounting for 3RT2 contactors and 3RH2 contactor relays, 10 A rated current at 24 V, AC-15 1 A at 690 V, IP20 front protection.","salesMarkdown":"It provides two normally open (2 NO) instantaneous contacts, wired via spring-loaded terminals that accept 2x (0.5 to 1.5 mm²) with ferrule or 2x (0.5 to 2.5 mm²) solid, or 2x (20 to 14 AWG). The snap-on fastening method means it clips directly onto the contactor front without tools, adding no extra DIN-rail width — useful when panel fill factor is tight. The headline ratings here are the contact current values across different voltages and duty categories. At 24 V the contacts are rated 10 A, dropping to 6 A at 230/250 V AC and 3 A at 400 V — these are the thermal current limits for general-purpose switching. For inductive loads under AC-15 duty (solenoid valves, contactor coils), the rating is 1 A at 690 V, which is the figure that governs most control-circuit applications in 400/480 V panels. Mechanical life is 10 million switching cycles typical, and contact reliability is specified as 1 faulty switching per 100 million operations at 17 V, 1 mA — that's the gold-plated low-level signal reliability figure, important if this switch carries PLC inputs or safety circuit feedback at low voltage. ## Deployment context This block snaps onto the front of a SIRIUS 3RT2 contactor or 3RH2 contactor relay, so it adds no additional panel width — the existing contactor's DIN-rail footprint stays unchanged. The spring-loaded terminals save wiring time compared to screw terminals, and the IP20 front protection means it's suitable for enclosed panels where no one touches live parts.","metaTitle":"Siemens SIRIUS 3RH2911-2HA20-ZW97 Auxiliary Switch, 2 NO, 10","metaDescription":"Siemens SIRIUS 3RH2911-2HA20-ZW97 auxiliary switch block, 2 NO contacts, spring-loaded terminals, rated 10 A at 24 V, AC-15 1 A at 690 V. Snap-on for 3RT2/3RH2 contactors. Current","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","Depth":"47.7 mm","Width":"36 mm","Height":"41.5 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)","Without Core End Processing":"2x (0.5 ... 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 ... 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":"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=139951&mlfb=3RH2911-2HA20-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA20-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH2911-2HA20-ZW97?","answer":"The 3RH2422-1AB00 is another SIRIUS auxiliary switch block, but it is a different form factor and mounting method. The 3RH2911-2HA20-ZW97 is specifically designed to snap onto the front of 3RT2/3RH2 devices, while the 3RH2422-1AB00 is a standalone contactor relay with its own coil. They are not drop-in replacements; the 3RH2911-2HA20-ZW97 is an add-on block, not a standalone relay."},{"question":"What does the note 'with 3RH2' mean?","answer":"The note 'with 3RH2' indicates this auxiliary switch block is designed to mount on the front of Siemens SIRIUS 3RH2 contactor relays, as well as 3RT2 contactors."},{"question":"What is the depth of 3RH2911-2HA20-ZW97?","answer":"The depth is 47.7 mm. Width is 36 mm, height is 41.5 mm. These dimensions are for the auxiliary block itself, not the contactor it mounts on."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2HA20-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/3RH2911-2HA20-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}}