{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9122-6KK01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9122-6KK01","canonicalUrl":"https://aoctrl.com/siemens/5SM9122-6KK01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9122-6KK01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9 series, RC unit electronic, 2-pole, type A, short-time delayed, In: 40 A, IΔn: 10 mA, Un AC: 230/400 V.","salesMarkdown":"## Thermal derating and real-world fit The 5SM9122-6KK01: The 40 A rating holds at 40 °C and 45 °C (37.2 A at both), then begins a gentle slope: 36 A at 50 °C, 34.8 A at 55 °C, 34 A at 60 °C, 33.2 A at 65 °C, and 32 A at 70 °C. The short-time delayed characteristic (selectivity class) lets it coordinate with downstream RCDs, avoiding nuisance trips on transient leakage from motor starts or capacitor inrush. The 10 mA trip threshold is sensitive enough for personnel protection (direct contact) in wet or medical-adjacent zones, but the delay prevents false tripping on normal equipment leakage. ## Panel integration This is a 2-pole modular device in the SENTRON 5SM9 design, sized for standard DIN-rail mounting in a distribution board or sub-panel. The 230/400 V AC supply voltage covers both single-phase and line-to-line feeds. No neutral conductor switching — it's a 2-pole RC unit, so it switches both phase conductors on a single-phase circuit or two phases on a three-phase system. Lifecycle status is current — no phase-out, no last-time-buy window. No official successor exists because none is needed.","metaTitle":"Siemens 5SM9122-6KK01 SENTRON RC Unit, 40 A, 10 mA, Type A","metaDescription":"Siemens SENTRON 5SM9122-6KK01 RC unit electronic, 2-pole, type A, short-time delayed, 40 A rated, 10 mA trip, 230/400 V AC. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"title":"5SM9122-6KK01","at 40 Cel":"37.2 A","at 45 Cel":"37.2 A","at 50 Cel":"36 A","at 55 Cel":"34.8 A","at 60 Cel":"34 A","at 65 Cel":"33.2 A","at 70 Cel":"32 A","Rated Value":"50 Hz","description":"RC unit, 2-pole, type A, short-time delayed, In: 40 A, 10 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":"Short-time delayed","Type of fault current":"A","circuit-breaker / Design":"5SM9","Current / at AC / rated value":"40 A","Supply voltage / at AC / rated value":"230/400 V","Tripping residual current / rated value":"10 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3bf6efd187f2e66ff06d55488ee782e1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629167&mlfb=5SM9122-6KK01"},"ai":{"faq":[{"question":"What is the thermal derating at 40 °C for 5SM9122-6KK01?","answer":"At 40 °C the rated current is 37.2 A. It holds that same figure at 45 °C, then derates stepwise through 50 °C (36 A), 55 °C (34.8 A), 60 °C (34 A), 65 °C (33.2 A), and 70 °C (32 A)."},{"question":"Where can I buy 5SM9122-6KK01?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What does Type A fault current detection mean for this RC unit?","answer":"Type A detects both sinusoidal AC residual currents and pulsating DC residual currents, covering the leakage profiles from single-phase rectifiers, switch-mode power supplies, and VFDs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9122-6KK01","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/5SM9122-6KK01 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}}