{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1656-1KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1656-1KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU1656-1KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1656-1KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU1 series RCBO, 2-pole (1P+N), 40 A rated current, C tripping characteristic, 6 kA breaking capacity per EN 60898, type AC fault current, instantaneous design.","salesMarkdown":"The Siemens 5SU1656-1KK40 is a SENTRON 5SU1 series RCBO — a combined residual-current circuit breaker and miniature circuit breaker in one 2-module (36 mm wide) package. It occupies a single DIN-rail position in a distribution board, rated for 40 A at AC with a C tripping characteristic and 6 kA breaking capacity per EN 60898. The 1P+N pole configuration means it switches the phase and monitors the neutral, tripping on AC fault currents only. For panel thermal planning: the unit dissipates up to 15.6 W at rated load, and current must be derated as ambient temperature rises — from 40 A at 30 °C down to 29.2 A at 70 °C. That derating curve is the one that governs real-world fill factor in a sealed enclosure. The 36 mm width (2 width units) and 70 mm installation depth fit standard SENTRON distribution boards. Terminal capacity accepts solid or stranded conductors from 0.75 mm² up to 35 mm² — sized for the full 40 A circuit without pigtailing.","metaTitle":"Siemens 5SU1656-1KK40 SENTRON RCBO 2P 40A C-Curve 6kA","metaDescription":"Siemens 5SU1656-1KK40 SENTRON RCBO, 2-pole 1P+N, 40A rated, C tripping characteristic, 6kA breaking capacity per EN 60898. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Maximum":"15.6 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"40 A","at 40 Cel":"37.6 A","at 45 Cel":"36.4 A","at 50 Cel":"34.8 A","at 55 Cel":"32.4 A","at 60 Cel":"32.4 A","at 65 Cel":"30.8 A","at 70 Cel":"29.2 A","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"RCBO","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Design of the product":"Instantaneous","Energy limiting class":"3","Number of width units":"2","Type of fault current":"AC","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU1","Current / at AC / rated value":"40 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"6 kA","For Testing Equipment / Minimum":"100 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","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"300 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Product function / neutral conductor switching":"Yes","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4210ad52523cbb42aa526c9808ea520e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=465855&mlfb=5SU1656-1KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1656-1KK40/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SU1656-1KK40 rated current and breaking capacity?","answer":"Rated 40 A at AC with a C tripping characteristic and 6 kA breaking capacity per EN 60898."},{"question":"What conductor sizes does the 5SU1656-1KK40 accept?","answer":"Solid and stranded conductors from 0.75 mm² up to 35 mm²."},{"question":"How do I get current pricing and availability for the 5SU1656-1KK40?","answer":"This part is sourced to order against an RFQ through independent distribution — submit an RFQ for current pricing and availability confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1656-1KK40","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/5SU1656-1KK40 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}}