{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1LA20-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1LA20-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1LA20-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1LA20-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1LA20-ZW96 auxiliary switch block, 2 NO contacts, 10 A maximum rated current, screw-type terminals, front-mount for 3RT2 contactors and 3RH2 contactor relays, snap-on mounting.","salesMarkdown":"## What this auxiliary switch block does on a 3RT2 or 3RH2 The 3RH2911-1LA20-ZW96 is a front-mounted auxiliary switch block that adds two normally-open (NO) contacts to a Siemens 3RT2 contactor or 3RH2 contactor relay. It's the part you snap onto the front of the contactor to get extra signal feedback — typically for PLC inputs, status lamps, or interlocking circuits — without taking up another DIN slot. Rated 10 A maximum, with a 10 A rated value at 24 V, this block handles the control-circuit currents you'd expect from a SIRIUS auxiliary contact. The AC-15 rating at 690 V is 1 A, which covers most 480 V and 690 V control schemes. ## Mounting and panel fit — snap-on front, not DIN-rail This block snaps onto the front of the contactor, not onto the DIN rail. The 36 mm width matches the 3RT2/3RH2 footprint, so it doesn't add panel width — just depth. The 43.7 mm depth is the total projection from the contactor face, which matters when the enclosure door clearance is tight. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors, or 2x (20 to 16) and 2x (18 to 14) AWG. No special crimp tool needed — just a standard screwdriver. ## Switching capacity across voltages — where this block works The contact ratings drop as voltage rises: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 3 A at 400 V, and 0.26 A at 600 V. The 10 A maximum at 24 V rated value is the thermal current ceiling — derate for inductive loads per the AC-15 curve. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA. That means this block is trustworthy for dry-contact signals to a PLC input — it won't miss edges at low voltage and low current. Mechanical service life is 10 million switching cycles typical. For a contactor cycling once every 10 seconds, that's over 3 years of continuous operation before the block wears out. ## Lifecycle and sourcing — active, no obsolescence concern Sourced and quoted to order against your BOM quantity through independent distribution.","metaTitle":"Siemens 3RH2911-1LA20-ZW96 Auxiliary Switch, 2 NO, 10 A","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH2911-1LA20-ZW96, 2 NO contacts, rated 10 A max. Front-mount for 3RT2/3RH2 contactors.","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","title":"3RH2911-1LA20-ZW96","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","description":"auxiliary switch, on the front, 2 NO, 73/74, 83/84, current path: 1 NO, 1 NO, cable entry from the top, screw terminal, for contactors 3RT2 and contactor relays 3RH2, multi-unit packaging, pack = 240 units","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a85da5c0927cee4b8d23e7cfd94ff564.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=88456&mlfb=3RH2911-1LA20-ZW96"},"ai":{"faq":[{"question":"What contactors does 3RH2911-1LA20-ZW96 fit?","answer":"It mounts on the front of Siemens 3RT2 contactors and 3RH2 contactor relays. The note 'with 3RH2' confirms compatibility with the contactor relay series."},{"question":"What is the maximum current rating of 3RH2911-1LA20-ZW96?","answer":"10 A maximum, with a 10 A rated value at 24 V. At 230 V AC it's rated 6 A; at 400 V it drops to 3 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1LA20-ZW96","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-ZW96 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}