{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9625-0KK","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9625-0KK","canonicalUrl":"https://aoctrl.com/siemens/5SM9625-0KK","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9625-0KK","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9 series, RC unit electronic, instantaneous, type AC, 2-pole, In 63 A, IΔn 300 mA, Un AC 400 V.","salesMarkdown":"The Siemens SENTRON 5SM9625-0KK is a 2-pole residual current unit (RC unit) from the 5SM9 design series, rated 63 A at 230/400 V AC with a 300 mA tripping residual current. That 300 mA threshold puts it in the fire-protection range rather than personnel protection (which typically requires 30 mA or lower), so it's sized for branch-circuit or feeder protection where the goal is equipment and wiring insulation fault detection, not shock prevention. ## Thermal derating — the real-world current capacity The 63 A rating holds at 40 °C and 45 °C (58.59 A at both, per the spec), then starts stepping down: 56.7 A at 50 °C, 54.81 A at 55 °C, 53.55 A at 60 °C, 52.29 A at 65 °C, and 50.4 A at 70 °C. If this unit lives inside a warm panel — say next to contactors or a busbar run — the 50 °C derated figure of 56.7 A is the number to use for conductor sizing and load planning, not the nameplate 63 A. The 70 °C floor of 50.4 A tells you the thermal limit is real but not severe; the unit sheds about 20% of its rated current across a 30 °C rise. The instantaneous design means no coordination delay with downstream RCDs — it trips at the same speed as a standard residual current device. Type AC classification limits it to sinusoidal AC fault currents; if the installation has non-sinusoidal loads (VFDs, switched-mode supplies, rectifiers), a type A or type F RC unit would be the correct choice instead.","metaTitle":"Siemens SENTRON 5SM9625-0KK RC Unit, 2-Pole, 63 A, 300 mA, 4","metaDescription":"Siemens SENTRON 5SM9625-0KK RC unit electronic, 2-pole, type AC, 63 A rated, 300 mA tripping residual current, 230/400 V AC. Active lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"title":"5SM9625-0KK","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","description":"RC unit, 2-pole, type AC, In: 63 A, 300 mA, Un AC: 400 V","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":"300 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/623e075f91f0fb7030449c33a777fce0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629207&mlfb=5SM9625-0KK"},"ai":{"faq":[{"question":"Where can I buy 5SM9625-0KK and how is it quoted?","answer":"Sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What do the thermal derating values mean for installation?","answer":"The 63 A rating is at 40 °C ambient; at 50 °C it derates to 56.7 A, and at 70 °C to 50.4 A. For panel installations where ambient exceeds 40 °C, use the derated figure for load planning and conductor sizing."},{"question":"Will 5SM9625-0KK drop into a panel designed for 5SU9354-7KK16?","answer":"Not a direct mechanical or electrical swap. The 5SU9354-7KK16 is an RCBO (RCD + MCB in one unit) with a C-curve overcurrent characteristic and 10 kA breaking capacity, while the 5SM9625-0KK is a bare RC unit without overcurrent protection. The 5SU part also has different width (36 mm vs the 5SM9's 2-pole width) and a 30 mA trip threshold vs 300 mA. Panel rewiring and a separate MCB would be required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9625-0KK","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/5SM9625-0KK when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}