{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1874-7BK82","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1874-7BK82","canonicalUrl":"https://aoctrl.com/siemens/5SU1874-7BK82","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1874-7BK82","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU1874-7BK82, selective RCBO, 4-pole, 125 A, Type B fault current, C characteristic, 10 kA breaking capacity, 230/400 V AC.","salesMarkdown":"## Selective RCBO for feeder protection The Siemens 5SU1874-7BK82 is a 4-pole selective RCBO from the SENTRON 5SU1 series, combining overcurrent protection and residual current detection in a single 11-module-wide unit. Rated 125 A at 230/400 V AC with a C tripping characteristic, it delivers a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2 — the dual standard covering domestic and industrial installations. The Type B fault-current detection handles smooth DC, pulsed DC, and AC residual currents, which matters for variable-speed drives, UPS systems, and EV charging infrastructure where pure AC-sensing RCDs would blind. Because it is selective (time-delayed), the 5SU1874-7BK82 coordinates with downstream RCDs so that a fault on a sub-circuit trips the local device first — the main stays in, keeping the rest of the distribution board live. That selectivity is the difference between one machine dropping out and a whole panel going dark. ## Thermal derating and mounting flexibility The 125 A rating holds at 30 °C ambient; at 40 °C it derates to 115.62 A, at 50 °C to 106.25 A, and at 60 °C to 96.25 A. Installation depth is 70 mm (overall depth 77 mm), width 198 mm (11 width units), height 90 mm.","metaTitle":"Siemens 5SU1874-7BK82 SENTRON RCBO, 125 A, Type B, 10 kA","metaDescription":"Siemens SENTRON 5SU1874-7BK82 selective RCBO, 4-pole, 125 A, Type B fault current, 10 kA breaking capacity (EN 60898 / IEC 60947-2). Current production. Sourced to order. Request q","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"198 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","at 30 Cel":"125 A","at 40 Cel":"115.62 A","at 45 Cel":"111.25 A","at 50 Cel":"106.25 A","at 55 Cel":"101.25 A","at 60 Cel":"96.25 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Degree of pollution":"2","Operating frequency":"50/60 Hz","Product designation":"RCBO","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"230/400 V","Overvoltage category":"III","Design of the product":"selective","Energy limiting class":"3","Number of width units":"11","Type of fault current":"B","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":"125 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"4","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":"1 000 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"5 kA","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=507138&mlfb=5SU1874-7BK82","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1874-7BK82/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SU1874-7BK82 and how do I get a price?","answer":"This part is sourced through our independent distribution channels and quoted to order against an RFQ. Send us your quantity and target delivery window; we confirm availability and current pricing at quote time."},{"question":"What does Type B fault current detection mean for this RCBO?","answer":"Type B detects smooth DC, pulsed DC, and AC residual currents up to the rated sensitivity. That covers the DC fault component from variable-frequency drives, UPS rectifiers, and EV chargers — applications where a standard Type A RCD would not trip on pure DC leakage."},{"question":"What is the breaking capacity of 5SU1874-7BK82?","answer":"It carries a 10 kA breaking capacity rated under both EN 60898 and IEC 60947-2, so it is accepted in domestic-distribution boards (EN standard) and industrial switchgear (IEC standard)."},{"question":"Will 5SU1874-7BK82 drop into a panel specified around 5SL4363-7?","answer":"No — the 5SU1874-7BK82 is a selective RCBO (RCD + MCB in one) at 125 A, 11 width units, while the 5SL4363-7 is a standard MCB with different form factor and no residual current function. They are not footprint-compatible; the panel busbar and wiring would need rework."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1874-7BK82","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/5SU1874-7BK82 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}}