{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1GA40-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1GA40-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1GA40-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1GA40-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1911-1GA40-ZW98, 4 NO contacts (40 E), screw-type terminals, snap-on mounting, 10 A maximum, IP20 front.","salesMarkdown":"The Siemens SIRIUS 3RH1911-1GA40-ZW98 is a 4-pole auxiliary switch block with 4 normally-open contacts (40 E per EN 50011), designed for snap-on mounting onto contactor relays and power contactors in the SIRIUS family. It uses screw-type terminals and carries a maximum thermal current rating of 10 A, with contact reliability rated at 1 faulty switching per 100 million operations at 17 V, 1 mA — a figure that matters for low-signal PLC input circuits where a single false closure can cause a misread. ## Lifecycle and replacement path This order code is a phased-out product. The manufacturer lists the successor as the SIRIUS 3RH2 series — a form-fit-function evolution that maintains the same 4-pole auxiliary contact arrangement but updates the platform. For a BOM line frozen around the 3RH1911 footprint, the 3RH2 block is the direct drop-in replacement candidate to validate against the existing panel layout and wire lengths. The 4 NO contacts (40 E) suit applications requiring multiple isolated feedback signals from a single contactor — for example, sending one pair to the PLC input card and another to a hardwired safety circuit. The 10 A maximum thermal current covers most control-circuit loads, but the switching capacity varies significantly by voltage: at 24 V DC it handles 6 A (resistive), while at 220 V AC it drops to 0.3 A. The AC-15 rating at 690 V is 1 A, confirming this block is intended for auxiliary switching of contactor coils, solenoid valves, and indicator lamps — not motor loads. Insulation voltage is 690 V with pollution degree 3, and surge voltage resistance is 6 kV, which keeps the block reliable in industrial panels without additional suppression on the auxiliary circuit. The screw terminals accept 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. Dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep — compact enough for dense panel layouts. Front protection is IP20; the block is rated for operation from -25 °C to +60 °C and storage from -55 °C to +80 °C.","metaTitle":"Siemens 3RH1911-1GA40-ZW98 SIRIUS Auxiliary Switch Block, 4","metaDescription":"Siemens SIRIUS 3RH1911-1GA40-ZW98 auxiliary switch block, 4 NO contacts, 10 A max, screw terminals, snap-on DIN rail. Phased-out; successor is 3RH2 series. Sourced to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH1","Depth":"41.5 mm","Width":"36.5 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","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=349348&mlfb=3RH1911-1GA40-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1GA40-ZW98/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RH1911-1GA40-ZW98?","answer":"The closest functional peer is the SIRIUS 3RH2140-1BP40, which also provides 4 NO contacts (40 E) with screw terminals and a 10 A maximum rating. However, the 3RH2140-1BP40 is physically larger (45 mm wide, 73 mm deep vs 36.5 mm wide, 41.5 mm deep) and mounts via screw or snap-on onto DIN rail rather than direct snap-on to a contactor relay. It will not drop into a panel wired for the 3RH1911 without verifying space and mounting provisions."},{"question":"Where can I buy 3RH1911-1GA40-ZW98?","answer":"This phased-out auxiliary switch block is sourced through independent industrial distribution channels. Availability and current pricing are confirmed at quote time against an RFQ. Submit a request for a firm quotation on your required quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1GA40-ZW98","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/3RH1911-1GA40-ZW98 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}}