{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9425-0KK","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9425-0KK","canonicalUrl":"https://aoctrl.com/siemens/5SM9425-0KK","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9425-0KK","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9 series, RC unit electronic, instantaneous design, 2-pole, type AC, In: 63 A, IΔn: 100 mA, Un AC: 230/400 V, 50 Hz.","salesMarkdown":"The Siemens 5SM9425-0KK is a SENTRON residual current (RC) unit — a 2-pole, type AC device rated for 63 A continuous at 230/400 V AC, 50 Hz, with a 100 mA tripping threshold. It's an instantaneous electronic RC unit, meaning no intentional time delay; it trips as soon as the residual current exceeds 100 mA. At 40 °C and 45 °C it carries the full 58.59 A without derating; from 50 °C upward the current capacity steps down gradually to 50.4 A at 70 °C. The 63 A rating governs the load it can pass continuously in a 40 °C ambient — sized for a submain or a large final circuit. The 100 mA residual sensitivity is less common than the standard 30 mA (personnel protection); 100 mA is typically specified for equipment protection or where nuisance tripping from leakage on long cable runs is a concern. The 2-pole construction (switching both phase and neutral) fits single-phase or split-phase panels where the neutral must be interrupted.","metaTitle":"Siemens 5SM9425-0KK SENTRON RC Unit, 2-Pole, 63 A, 100 mA, 4","metaDescription":"Siemens 5SM9425-0KK SENTRON RC unit electronic, 2-pole, type AC, 63 A rated, 100 mA tripping residual current, 230/400 V AC. Current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"at 40 Cel":"58.59 A","at 45 Cel":"58.59 A","at 50 Cel":"56.7 A","at 55 Cel":"54.81 A","at 60 Cel":"53.55 A","at 65 Cel":"52.29 A","at 70 Cel":"50.4 A","Rated Value":"50 Hz","Number of poles":"2","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"RC unit electronic","Design of the product":"Instantaneous","Type of fault current":"AC","circuit-breaker / Design":"5SM9","Current / at AC / rated value":"63 A","Supply voltage / at AC / rated value":"230/400 V","Tripping residual current / rated value":"100 mA"}},"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=629200&mlfb=5SM9425-0KK","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM9425-0KK/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM9425-0KK and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 5SM9425-0KK's rated current at 40 °C?","answer":"At 40 °C the part carries 58.59 A. The same 58.59 A holds at 45 °C; above that it derates stepwise to 50.4 A at 70 °C."},{"question":"Will 5SM9425-0KK drop into a panel that was specified around 5SJ3140-7 without rewiring?","answer":"No — these are different device classes. The 5SJ3140-7 is a 1-pole miniature circuit breaker (MCB) with a 40 A rating and C-curve trip characteristic. The 5SM9425-0KK is a 2-pole residual current unit with 63 A rating and 100 mA trip threshold. They serve different functions (overcurrent protection vs. earth leakage protection) and occupy different DIN positions. A panel specified for the MCB would need additional wiring and space for the RC unit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9425-0KK","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/5SM9425-0KK 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}}