{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1356-1KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1356-1KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU1356-1KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1356-1KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU1356-1KK40 RCBO, 2-pole (1P+N), 40 A, 30 mA residual, Type AC, tripping characteristic C, 6 kA (EN 60898) / 10 kA (IEC 60947-2), IP20, 2 MW.","salesMarkdown":"## What it is and what it does The Siemens 5SU1356-1KK40 is a SENTRON RCBO — a combined residual-current device and miniature circuit breaker in one 2-module-wide (36 mm) package. It protects a single-phase final subcircuit against overload, short-circuit, and earth leakage in one unit, saving a DIN-rail position over separate RCD and MCB. Rated 40 A with a C tripping curve, it handles motor-starting inrush and moderate transformer loads without nuisance trips. The residual element is Type AC — sensitive to sinusoidal AC fault currents only, not pulsed DC or smooth DC — so it's suited for general-purpose socket outlets and lighting circuits where no electronic loads are downstream. Breaking capacity is 6 kA per EN 60898 (the household standard) and 10 kA per IEC 60947-2 (the industrial standard), giving it headroom for most commercial and light-industrial distribution boards with a prospective fault current under 10 kA. ## Mounting and environment Snaps onto a 35 mm DIN rail in any orientation — top or bottom feed accepted. The 77 mm depth fits standard distribution boards; the 70 mm installation depth leaves room for wiring behind the busbar. IP20 with the distribution board installed and conductors connected — not for wet or dusty environments. Rated for pollution degree 2 and overvoltage category III, which is the normal condition inside a dry indoor panel. Ambient temperature range from -40 °C to +75 °C covers cold storage and hot machine cabinets. Derate the 40 A rating above 30 °C: at 40 °C it's 37.6 A, at 50 °C it's 34.8 A, at 70 °C it's 29.2 A. That derating matters if the RCBO sits next to heat-generating contactors or drives.","metaTitle":"Siemens 5SU1356-1KK40 SENTRON RCBO, 40 A, 30 mA, Type AC, 6","metaDescription":"Siemens 5SU1356-1KK40 SENTRON RCBO, 40 A rated, 30 mA residual, Type AC, 6 kA per EN 60898, 10 kA per IEC 60947-2. Current production. Order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50 Hz","Product Designation":"RCBO","acc. to IEC 81346-2":"F","at AC / rated value":"40 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"AC","Number Of Poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","Weight / With Packaging":"302 g","at 30 °C / rated value":"40 A","at 40 °C / rated value":"37.6 A","at 45 °C / rated value":"36.4 A","at 50 °C / rated value":"34.8 A","at 55 °C / rated value":"32.4 A","at 60 °C / rated value":"32.4 A","at 65 °C / rated value":"30.8 A","at 70 °C / rated value":"29.2 A","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"6 kA","For Testing Equipment / Minimum":"195 V","Position / Of Power Supply Cord":"Either top or bottom","Number Of Poles / With Protection":"1","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","Tripping Fault Current / Rated Value":"30 mA","Supply Voltage Frequency / Rated Value":"50 Hz","Influence Of The Surrounding Temperature":"Max. 95% humidity","Surge Current Resistance / At (8/20) μS":"1 kA","Product Function / Neutral Conductor Switching":"Yes","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$34.29","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1559265e347ed92f697b61b495031587.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=44077&mlfb=5SU1356-1KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1356-1KK40/alternatives.json"},"ai":{"faq":[{"question":"What is 5SU1356-1KK40's listed depth (77 mm) on this component line?","answer":"The depth is 77 mm, with an installation depth of 70 mm. Width is 36 mm (2 modular width units), height is 90 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1356-1KK40","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/5SU1356-1KK40 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}}