{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1046-2UB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1046-2UB0","canonicalUrl":"https://aoctrl.com/siemens/3RB1046-2UB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1046-2UB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RB1046-2UB0 solid-state overload relay, 15...50 A, Class 20, screw connection, size S3, for contactor mounting, manual-automatic reset.","salesMarkdown":"The Siemens 3RB1046-2UB0 is a solid-state overload relay rated 15...50 A with a Class 20 trip curve, designed to mount directly onto a contactor. It uses screw connections and is sized as S3, with a manual-automatic reset selector. This is a current-production part, so it's still a standard BOM line item, not a last-time-buy scavenger hunt. This relay mounts onto the contactor, not on a DIN rail — it's a direct-add-on thermal-magnetic replacement in solid-state form. The screw terminals accept standard power wiring, and the manual-automatic reset selector lets you choose between a latching trip (manual reset) and a self-resetting mode for remote or unattended installations. The S3 footprint is common across the 3RB1 series, so swapping in a different current range later doesn't require re-wiring the contactor.","metaTitle":"Siemens 3RB1046-2UB0 Solid-State Overload Relay, 15-50A, Cla","metaDescription":"Siemens 3RB1046-2UB0 solid-state overload relay, 15-50A, Class 20, for contactor mounting. Current lifecycle stage. Sourced to order against an 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=326307&mlfb=3RB1046-2UB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1046-2UB0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to the 3RB1046-2UB0 in the same family?","answer":"Within the 3RB1 series, the closest sibling would be a different current-range variant of the same S3 frame size, such as a 3RB1046-2UB1 for a lower range. The deciding factor is the motor FLA — pick the variant whose range brackets your motor's full-load amps. The physical footprint and wiring are identical across S3 variants."},{"question":"Does this relay mount on a DIN rail or directly onto a contactor?","answer":"It mounts directly onto a contactor, not on a DIN rail. The S3 frame size determines which contactor it mates with."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1046-2UB0","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/3RB1046-2UB0 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}}