{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9342-6KK","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9342-6KK","canonicalUrl":"https://aoctrl.com/siemens/5SM9342-6KK","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9342-6KK","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9 series, RC unit electronic, 4-pole, Type A, In: 40 A, 30 mA, Un AC: 400 V, order code 5SM9342-6KK.","salesMarkdown":"## Thermal derating — the real-world current capacity The 40 A rating holds at ambient temperatures up to 45 °C (37.2 A at both 40 °C and 45 °C). Above that, the unit derates progressively: 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. For a panel builder or site engineer, this means the RC unit's actual current-carrying capacity in a warm enclosure is lower than the nameplate 40 A — size upstream protection and cable accordingly if the ambient inside the panel exceeds 45 °C. The 5SM9 RC unit mounts on DIN rail. It occupies four modular width units for the 4-pole variant. The electronic instantaneous design trips within standard RCD response time for Type A fault currents.","metaTitle":"Siemens 5SM9342-6KK SENTRON RC Unit, 40A 30mA Type A, 4-Pole","metaDescription":"Siemens 5SM9342-6KK SENTRON RC unit electronic, 4-pole, Type A, 40 A rated, 30 mA trip, 400 V AC. Currently in production. 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":"5SM9342-6KK","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, 4-pole, type A, In: 40 A, 30 mA, Un AC: 400 V","Number of poles":"4","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"RC unit electronic","Design of the product":"Instantaneous","Type of fault current":"A","circuit-breaker / Design":"5SM9","Current / at AC / rated value":"40 A","Supply voltage / at AC / rated value":"400 V","Tripping residual current / rated value":"30 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d863037f7354a3ab4da2c120a0e2dd6e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629191&mlfb=5SM9342-6KK"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9342-6KK","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/5SM9342-6KK 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}}