{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2CA01-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2CA01-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2CA01-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA01-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RH1921-2CA01-ZW98, front-side auxiliary switch, 1 NC contact, Spring-type terminal, for contactors 3RT1, multi-unit packaging = 188 units.","salesMarkdown":"## Part identity and fit The Siemens 3RH1921-2CA01-ZW98 is a front-side auxiliary switch block with one normally-closed (NC) contact, terminated with spring-type (cage-clamp) terminals. It is designed to snap onto the front of 3RT1 series contactors, adding a feedback or interlock contact without additional wiring space on the rail. ## What the spring terminal means on the panel The 1 NC contact is the normally-closed mirror of the main contactor's state, typically used in safety circuits or as a feedback to a PLC input that the contactor has dropped out. Because it mounts on the front of the 3RT1, it does not consume additional DIN-rail space, which matters when the enclosure fill factor is tight.","metaTitle":"Siemens 3RH1921-2CA01-ZW98 Auxiliary Switch, 1 NC, Spring Te","metaDescription":"Siemens 3RH1921-2CA01-ZW98 front-side auxiliary switch with 1 NC contact, spring-type terminal for 3RT1 contactors. Lifecycle stage: current. Sourced to order.","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=524231&mlfb=3RH1921-2CA01-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA01-ZW98/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RH1921-2CA01-ZW98 and which contactors does it fit?","answer":"It is a front-side auxiliary switch block with one NC contact and spring-type terminals, designed for Siemens 3RT1 series contactors. It snaps onto the contactor front to add a feedback or interlock contact."},{"question":"What does the multi-unit packaging of 188 units mean for sourcing?","answer":"The 3RH1921-2CA01-ZW98 is packaged in multi-unit quantities of 188 pieces. This indicates it is a high-volume line item typically ordered in bulk for panel builds or as a stock spare. For smaller quantities, it is sourced to order against an RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2CA01-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/3RH1921-2CA01-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}}