{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1066-2LG0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1066-2LG0","canonicalUrl":"https://aoctrl.com/siemens/3RB1066-2LG0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1066-2LG0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RB1066-2LG0, solid-state overload relay, 300-630A, Class 20, with mounting rails for contactor mount on 3TF68/69 or separate mounting.","salesMarkdown":"The Siemens 3RB1066-2LG0 is a solid-state overload relay from the 3RB10 series, rated for motor protection from 300 to 630 A with a Class 20 trip curve. Class 20 means it allows a 20-second overload before tripping at 600% of the set current — standard for general-purpose motor starting where the inrush transient needs to ride through without nuisance trips. ## Integration notes The relay includes mounting rails for contactor mounting on 3TF68 or 3TF69 frames, or separate mounting on a DIN rail. In a panel, this means it can be ganged directly to the contactor to save rail space, or positioned remotely if heat dissipation or access for reset is a concern. The solid-state design eliminates the mechanical wear of bimetallic relays, which matters in high-cycle applications like conveyors or pumps.","metaTitle":"Siemens 3RB1066-2LG0 Solid-State Overload Relay, 300-630A, C","metaDescription":"Siemens 3RB1066-2LG0 solid-state overload relay, 300-630A, Class 20. 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=367241&mlfb=3RB1066-2LG0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1066-2LG0/alternatives.json"},"ai":{"faq":[{"question":"What is the current rating and trip class of this overload relay?","answer":"It is rated for 300 to 630 A and has a Class 20 trip curve, meaning it allows a 20-second overload at 600% of the set current before tripping."},{"question":"How does this relay mount in a panel?","answer":"It includes mounting rails for direct attachment to a 3TF68 or 3TF69 contactor, or for separate mounting on a DIN rail or panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1066-2LG0","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/3RB1066-2LG0 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}}