{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1342-7KC40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1342-7KC40","canonicalUrl":"https://aoctrl.com/siemens/5SU1342-7KC40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1342-7KC40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU1 series RCBO, 4-pole, 40 A rated, 30 mA type A residual current, C characteristic, 50 kA breaking capacity, 2 MW.","salesMarkdown":"## Siemens SENTRON 5SU1342-7KC40 RCBO — 40 A, 30 mA, Type A, 50 kA The Siemens SENTRON 5SU1342-7KC40 is a 4-pole RCBO (residual current circuit breaker with overcurrent protection) rated at 40 A with a 30 mA type A residual current trip and a C tripping characteristic. It carries a 50 kA breaking capacity per EN 60898 and IEC 60947-2, which means it can safely interrupt fault currents up to that level without upstream cascading — critical for high-fault-capacity installations like industrial distribution boards or commercial mains. Rated for 50 Hz supply and 690 V AC, this unit switches the neutral conductor and is designed for any mounting position with a 70 mm installation depth. The 40 A rated current with C characteristic handles motor inrush and transformer energization without nuisance tripping. The 30 mA type A residual current trip detects pulsating DC fault currents as well as sinusoidal AC. The 50 kA breaking capacity (Icn/Ics) at 690 V AC is the headline figure for selectivity coordination — it matches the fault level at the service entrance in most European industrial installations, so you don't need a backup fuse or upstream breaker with higher rating unless the prospective short-circuit current exceeds 50 kA. Energy limiting class 3 means it restricts let-through energy, reducing stress on downstream equipment during a fault. Conductor cross-section range of 0.75 to 35 mm² solid or stranded covers everything from control wiring to main feeder cables. The screw terminals require 2.5 to 3 N·m torque — standard for a 40 A device. The 5SU1342-7KC40 occupies 2 width units (36 mm on a standard DIN rail) and accepts supply from either top or bottom — flexible for busbar or cable entry in a distribution board. Ambient temperature range of -25 to +55 °C covers most indoor panel environments; storage range of -40 to +75 °C handles shipping and warehouse conditions. The touch protection feature (finger-safe terminals) reduces arc-flash risk during maintenance when the panel door is open.","metaTitle":"Siemens 5SU1342-7KC40 SENTRON RCBO, 40 A, 30 mA, Type A, 50","metaDescription":"Siemens SENTRON 5SU1342-7KC40 RCBO, 4-pole, 40 A rated, 30 mA type A residual current, 50 kA breaking capacity, energy limiting class 3. 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":{"Solid":"0.75 ... 35 mm²","Stranded":"0.75 ... 35 mm²","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"4","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":"A","Number of poles / Note":"4P","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":"50 kA","For Testing Equipment / Minimum":"195 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"4","acc. to IEC 60947-2 / rated value":"50 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"30 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/6e2e6ddacb60a42cb10c149ae3a30b8e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=486692&mlfb=5SU1342-7KC40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1342-7KC40/alternatives.json"},"ai":{"faq":[{"question":"What conductor sizes does 5SU1342-7KC40 accept?","answer":"The terminals accept solid or stranded conductors from 0.75 mm² up to 35 mm², covering control wiring through main feeder cables. Tightening torque is 2.5 to 3 N·m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1342-7KC40","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/5SU1342-7KC40 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}}