{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1025-2QB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1025-2QB0","canonicalUrl":"https://aoctrl.com/siemens/3RB1025-2QB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1025-2QB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB1025-2QB0 electronic overload relay, 6...25 A, class 20, screw connection, manual reset, size S0, for contactor mounting.","salesMarkdown":"The Siemens 3RB1025-2QB0 is an electronic overload relay in the SIRIUS 3RB series, rated 6...25 A with class 20 trip curve, screw terminals, manual reset only, and size S0 footprint for direct contactor mounting. The 6...25 A range covers motor FLA for small to mid-size induction motors — think 5.5 kW to 11 kW at 400 V three-phase. Class 20 means the relay allows up to 20 seconds at 600% of set current before tripping, matching standard motor start profiles for pumps, fans, and compressors. Manual reset only: once tripped, a local pushbutton must be pressed to reclose the N/C contact in the control circuit — no automatic restart, which is preferred for unattended or safety-monitored lines where unexpected re-energization is a hazard. Size S0 is the standard Siemens contactor-mount footprint for this current class. The relay clips directly onto the matching S0 contactor (e.g., 3RT20 series), saving DIN-rail space and eliminating separate wiring between contactor and overload. Screw terminals accept 0.5...4 mm² stranded or solid — strip 8 mm, torque to 0.8...1.2 Nm. No auxiliary power supply needed; the relay is self-powered from the CTs on the motor leads.","metaTitle":"Siemens 3RB1025-2QB0 Electronic Overload Relay, 6...25A, Cla","metaDescription":"Siemens 3RB1025-2QB0 electronic overload relay, 6...25A, class 20, for contactor mount, screw connection, manual reset, size S0. Active lifecycle, available to order.","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=343890&mlfb=3RB1025-2QB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1025-2QB0/alternatives.json"},"ai":{"faq":[{"question":"What is the current rating range of 3RB1025-2QB0?","answer":"It is rated 6...25 A, class 20, with screw connection and manual reset only."},{"question":"Where can I buy 3RB1025-2QB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Does 3RB1025-2QB0 mount directly to a contactor?","answer":"Yes, size S0 is designed for direct clip-on mounting to Siemens S0 contactors (3RT20 series), saving panel space and wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1025-2QB0","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/3RB1025-2QB0 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}}