{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1045-1EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1045-1EB0","canonicalUrl":"https://aoctrl.com/siemens/3RB1045-1EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1045-1EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB1045-1EB0 electronic overload relay, 25-100 A, Class 10, screw terminal, manual reset, size S3 for contactor mounting.","salesMarkdown":"The Siemens 3RB1045-1EB0 is an electronic overload relay in the SIRIUS family, rated 25...100 A with Class 10 trip characteristic. It mounts directly to a contactor of the same size S3 frame, using screw connections and a manual-only reset. ## Deployment context This relay is sized for the contactor-mount footprint (size S3), so it snaps onto the matching SIRIUS contactor without additional wiring between the relay output and the contactor coil — the load current passes through the relay's bimetallic or electronic sensing element, and the trip signal opens the contactor directly. The screw terminals accept the motor leads; no separate control wiring for the trip circuit is needed on this manual-reset variant. The lifecycle stage for this order code is listed as current, meaning Siemens continues to manufacture and support the 3RB1045-1EB0 as an active catalog item.","metaTitle":"Siemens 3RB1045-1EB0 Electronic Overload Relay, 25-100A, Cla","metaDescription":"Siemens 3RB1045-1EB0 electronic overload relay, 25-100A, Class 10, screw connection, manual reset, size S3. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"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=220893&mlfb=3RB1045-1EB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1045-1EB0/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RB1045-1EB0 used for?","answer":"It is an electronic overload relay rated 25...100 A, Class 10, with screw connection and manual reset, designed for contactor mounting in size S3. It protects motors from overload and phase loss by tripping the contactor when the current exceeds the set point for the Class 10 time curve."},{"question":"Where can I buy the 3RB1045-1EB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1045-1EB0","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/3RB1045-1EB0 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}}