{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB1246-1QG31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB1246-1QG31","canonicalUrl":"https://aoctrl.com/siemens/3RB1246-1QG31","factsUrl":"https://aoctrl.com/api/mcp/products/3RB1246-1QG31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB1246-1QG31 solid-state overload relay, 6.3 to 25 A, AC 110-120 V 50/60 Hz, with integrated thermistor protection and internal earth-fault detection, bistable outputs.","salesMarkdown":"The 3RB1246-1QG31 is a current-production solid-state overload relay from the Siemens SIRIUS family, rated 6.3 to 25 A at AC 110 to 120 V, 50/60 Hz. The 6.3-25 A range means it directly protects motor loads within that FLA band — set the dial to the motor nameplate current, and the solid-state sensing tracks true RMS heating without the drift of a bimetal. The 110-120 V control voltage is the coil supply for the relay's internal logic; if your panel runs 24 VDC or 230 VAC, this variant won't pull in. It integrates three protection functions in one housing: overload (standard Class 10/20 trip curve), thermistor motor protection (PTC sensor input for stator winding temperature), and internal earth-fault detection. That means a single DIN-rail device covers motor thermal protection, winding overtemp, and ground-leakage trip — no separate earth-leakage module needed. The output configuration is 1NO/1NC for the combined overload/thermistor/earth-fault signal, plus a separate 1NO/1NC for overload warning only. Both are bistable (latched), so the trip state holds after a fault clears — manual reset required. The 45 mm wide housing fits a standard SIRIUS contactor footprint; it can be snapped directly onto a 3RT2 contactor or ganged via the busbar system. The thermistor input (PTC) is a separate two-wire terminal — run a shielded pair from the motor's PTC sensor, no external converter. Earth-fault detection uses a separate toroid or the internal zero-sequence CT; verify the manual for the specific wiring scheme.","metaTitle":"Siemens 3RB1246-1QG31 Solid-State Overload Relay, 6.3-25 A,","metaDescription":"Current-production solid-state overload relay with integrated thermistor protection and earth-fault detection. 6.3-25 A, 110-120 VAC. Bistable outputs. 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=236032&mlfb=3RB1246-1QG31","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB1246-1QG31/alternatives.json"},"ai":{"faq":[{"question":"What protection functions does this relay combine?","answer":"It integrates solid-state overload protection (6.3-25 A), thermistor motor protection (PTC input), and internal earth-fault detection in a single housing. Outputs are 1NO/1NC for the combined fault signal and a separate 1NO/1NC for overload warning, both bistable."},{"question":"What control voltage does this variant require?","answer":"AC 110 to 120 V, 50/60 Hz. Not compatible with 24 VDC or 230 VAC control supplies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB1246-1QG31","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/3RB1246-1QG31 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}}