{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1246-1QM00-0FM0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1246-1QM00-0FM0","canonicalUrl":"https://aoctrl.com/siemens/3RB1246-1QM00-0FM0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1246-1QM00-0FM0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB12 series, solid-state overload relay, 6.3-25 A, AC 220-240 V 50/60 Hz, integrated thermistor protection, ground-fault monitoring via external summation current transformer, 1 NO + 1 NC contacts.","salesMarkdown":"The Siemens 3RB1246-1QM00-0FM0 is a solid-state overload relay from the SIRIUS 3RB12 series, integrating thermistor motor protection and ground-fault monitoring into a single DIN-rail mounted unit. It covers the 6.3 to 25 A adjustment range on AC 220-240 V 50/60 Hz supply, with ground-fault detection achieved through an external summation current transformer wired to the relay's inputs. The 6.3-25 A setting range matches standard IEC motor full-load currents for 4-15 kW motors at 400 V, depending on service factor. The 220-240 V AC control supply is the relay's operating voltage — not the motor voltage — so confirm panel control voltage matches. Ground-fault monitoring requires an external summation CT (not included); the relay provides the trip logic and two dedicated contacts (1 NO + 1 NC) for the ground-fault channel, separate from the overcurrent/thermistor channel which also has 1 NO + 1 NC. Both channels are monostable — they reset automatically when the fault clears and supply returns. ## Integration notes Snaps onto DIN rail per EN 60715. The external summation CT connects to the relay's dedicated terminals; the thermistor loop (PTC) connects to the motor's embedded PTC sensor chain. Both the overcurrent/thermistor and ground-fault output contacts are rated for the same control voltage as the relay supply. Verify the summation CT ratio matches the relay's ground-fault pickup setting — the relay does not include the CT.","metaTitle":"Siemens 3RB1246-1QM00-0FM0 Solid-State Overload Relay, 6.3-2","metaDescription":"Siemens 3RB1246-1QM00-0FM0 solid-state overload relay with integrated thermistor protection, 6.3-25 A, AC 220-240 V 50/60 Hz, ground-fault monitoring via external summation CT. Act","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=217947&mlfb=3RB1246-1QM00-0FM0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1246-1QM00-0FM0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RB1246-1QM00-0FM0 and get a price?","answer":"This relay is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the 3RB1246-1QM00-0FM0 used for?","answer":"It is a solid-state overload relay with integrated thermistor protection and ground-fault monitoring, used to protect three-phase AC motors in industrial control panels."},{"question":"What compliance documentation is available for 3RB1246-1QM00-0FM0?","answer":"The evidence does not list specific compliance certifications (RoHS, REACH, UL, IEC) for this order code. Standard Siemens SIRIUS documentation applies; confirm with the manufacturer for project-specific requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1246-1QM00-0FM0","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/3RB1246-1QM00-0FM0 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}}