{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9156-7VK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9156-7VK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9156-7VK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7VK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker (RCBO), 2-pole 1P+N, 40 A rated current, C-curve, Type A fault current, 6 kA / 10 kA breaking capacity, 77 mm depth, 36 mm width (2 MW).","salesMarkdown":"The Siemens 5SU9156-7VK40 is a 2-pole (1P+N) RCBO from the SENTRON 5SU9 series — a combined overcurrent and residual-current device that fits a single 36 mm wide module (2 width units) on a DIN rail. It protects a 40 A final circuit with a C-curve magnetic trip for motor or lighting inrush and a 30 mA Type A RCD element that catches pulsating DC fault currents from electronics or variable-speed drives. Rated current derates with ambient temperature: 40 A at 30 °C, 37.6 A at 40 °C, 36.4 A at 45 °C, 34.8 A at 50 °C, 32.4 A at 55 °C. If the panel runs at 40 °C ambient, the usable load drops to 37.6 A — a 40 A breaker on a 40 A continuous load would nuisance-trip. Terminals accept solid or stranded copper from 0.75 mm² up to 35 mm², which covers everything from a 1.5 mm² lighting circuit to a 10 mm² feeder. The 77 mm depth plus 70 mm installation depth means it clears a standard 100 mm deep enclosure back wall with room for wiring fingers. ## Deployment context Mounts on a DIN rail in any orientation — vertical, horizontal, upside-down — which simplifies layout in a tight enclosure. The IP20 rating applies only when the distribution board is installed and conductors are connected; the device itself is not sealed for washdown or outdoor use. Type A RCD detects sinusoidal AC faults plus pulsating DC up to 6 mA smooth DC superimposed — critical for circuits with half-wave rectifiers, switch-mode power supplies, or VFDs that can blind a standard AC-only RCD. If the downstream load includes a single-phase drive or LED driver, Type A is the minimum for code compliance in most jurisdictions.","metaTitle":"Siemens 5SU9156-7VK40 SENTRON RCBO, 40A C-curve, 30mA Type A","metaDescription":"Siemens 5SU9156-7VK40 SENTRON RCBO, 2-pole 1P+N, 40A C-curve, 30mA Type A RCD, 6kA (EN 60898) / 10kA (IEC 60947-2). Current production. Quoted 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":"1.5 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","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 ... +45 °C","Product designation":"RCD-operated circuit breaker","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Energy limiting class":"3","Number of width units":"2","Type of fault current":"A","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Current / at AC / rated value":"40 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"6 kA","For Testing Equipment / Minimum":"125 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":"10 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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629246&mlfb=5SU9156-7VK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7VK40/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SU9156-7VK40?","answer":"6 kA per EN 60898 for distribution boards and 10 kA per IEC 60947-2 for industrial panels."},{"question":"What wire sizes does the 5SU9156-7VK40 accept?","answer":"Solid or stranded copper from 0.75 mm² up to 35 mm²."},{"question":"Where can I buy the 5SU9156-7VK40 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the difference between the 5SU9156-7VK40 and the 5SL6563-7BB?","answer":"The 5SL6563-7BB is a standard MCB without residual-current protection, while the 5SU9156-7VK40 is an RCBO combining overcurrent and 30 mA Type A RCD protection in one module. The 5SU9156-7VK40 will not drop into a panel wired for a bare MCB without adding the RCD function — it occupies the same 2-MW footprint but requires the neutral connection for the RCD electronics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9156-7VK40","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/5SU9156-7VK40 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}}