{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1FA40-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1FA40-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1FA40-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1FA40-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1FA40-ZW96 auxiliary switch block, 4 NO contacts, front-mounted, screw-type terminals, IP20, snap-on DIN rail mounting, for 3RH2 contactor relays and 3RT2 contactors.","salesMarkdown":"## Front-mounted auxiliary switch for 3RH2 and 3RT2 The 3RH2911-1FA40-ZW96 is a front-mounted auxiliary switch block from the Siemens SIRIUS family, designed to snap onto 3RH2 contactor relays and 3RT2 power contactors. The note 'with 3RH2' confirms the mechanical interface — this block mounts directly on the front of the relay, adding four normally open (4 NO) instantaneous contacts without increasing the panel footprint beyond the base device. Rated operational current in AC-15 duty (solenoid and contactor coil switching) is 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. These ratings define the inductive load switching capability — the 10 A at 24 V is the headline figure for typical 24 VDC control circuits, while the 3 A at 400 V covers line-voltage coil applications. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA, meaning this block handles low-level signal switching (e.g., PLC inputs) without the contact oxidation problems that plague standard power contacts at dry-circuit levels. ## DIN rail snap-on and wiring constraints Fastening is snap-on mounting to a standard DIN rail — no tools needed for installation, but the block must be positioned on the rail before the base contactor or relay is wired. Dimensions are 36 mm wide, 43.7 mm deep, and 37.5 mm high, so it adds minimal depth to the assembly. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. The dual-conductor capacity per terminal is useful for daisy-chaining control wiring without additional junction points. Front protection class is IP20 — finger-safe but not sealed against dust or moisture. The block is intended for use inside a control cabinet rated to at least IP54; it is not suitable for washdown or outdoor exposure without an enclosure. ## Active production and sourcing posture Mechanical service life is 10 million switching cycles typical, which suits high-cycle applications like conveyor interlocking or machine tool sequences where the auxiliary contacts see frequent operation. Insulation voltage is 690 V AC at pollution degree 3, with a rated surge voltage resistance of 6 kV. This means the block is coordinated for use in industrial panels where transient overvoltages from motor switching or lightning-induced surges are present, without requiring additional surge suppression on the auxiliary circuit.","metaTitle":"Siemens 3RH2911-1FA40-ZW96 Auxiliary Switch, 4 NO, 10 A","metaDescription":"Siemens SIRIUS auxiliary switch block, 4 NO contacts, rated 10 A at 24 V AC-15. Front-mount for 3RH2/3RT2. Active production, screw terminals, snap-on DIN rail.","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":"3RH2911-1FA40-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, 4 NO,.3/.4,.3/.4,.3/.4,.3/.4, current path: 1 NO, 1 NO, 1 NO, 1 NO, 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":"4","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/9f2ffb75aeba8534cb7f6d55549c3abb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=36443&mlfb=3RH2911-1FA40-ZW96"},"ai":{"faq":[{"question":"What is the note 'with 3RH2' on this part?","answer":"The note indicates this auxiliary switch block is designed to mount on the front of Siemens 3RH2 contactor relays. It also fits 3RT2 power contactors. The mechanical interface and terminal arrangement are specific to these series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1FA40-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/3RH2911-1FA40-ZW96 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}