{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1MA20-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1MA20-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1MA20-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1MA20-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens auxiliary switch block, 3RH1911-1MA20-ZW95, 2NO, screw connection from below, for contactor relays and contactors size S00.","salesMarkdown":"The 3RH1911-1MA20-ZW95: The 2NO contact configuration gives you two independent normally-open auxiliary contacts that close when the main contactor or relay picks up. This is the standard arrangement for signalling the main device's status back to a PLC input, or for interlocking a second contactor in a reversing or star-delta starter. The screw connection from below matches the wiring convention on most S00 contactor assemblies, where the auxiliary block stacks on top of the main device and the line-side wiring enters from underneath. If your panel uses cage-clamp or spring-cage terminals on the main contactor, this block's screw terminals mean a mixed termination style on the same device. ## Deployment context This block clips onto the front of a SIRIUS 3RT2 contactor or 3RH2 contactor relay of size S00. It adds auxiliary contacts without increasing the panel depth beyond the main device's envelope. The DIN EN 50005 mounting profile means it aligns with the standard 45 mm width of the S00 frame, so it fits in the same DIN-rail footprint.","metaTitle":"3RH1911-1MA20-ZW95 auxiliary switch block, 2NO, screw connec","metaDescription":"Siemens 3RH1911-1MA20-ZW95 auxiliary switch block, 2NO, screw connection from below, for contactor relays size S00. Lifecycle stage: current. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"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=161821&mlfb=3RH1911-1MA20-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1MA20-ZW95/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to this auxiliary switch block in the same family?","answer":"The 3RH1911-1MA20-ZW95 is distinguished by its 2NO contact configuration and screw connection from below. A sibling with the same contact arrangement but with cage-clamp terminals would be the 3RH1911-1MA20-ZW96 variant. The choice between them depends on whether your panel uses screw or spring-cage terminations on the main contactor."},{"question":"What does the description 'for switching motors, sizes S00' mean?","answer":"It means this auxiliary block is mechanically and electrically rated to mount on Siemens contactors and contactor relays of frame size S00, which cover motor loads up to about 7.5 kW at 400 V AC-3 duty. The block itself does not switch motor current directly — it signals the contactor's position to a control system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1MA20-ZW95","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/3RH1911-1MA20-ZW95 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}}