{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3735-1","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3735-1","canonicalUrl":"https://aoctrl.com/siemens/5SP3735-1","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3735-1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3 series, main miniature circuit breaker (selective), 3-pole, 35A, 25kA per EN 60898, tripping characteristic E, 400V AC, 50 Hz, standard rail mount.","salesMarkdown":"## Selective main MCB for distribution It carries a 35 A rated current at 400 V AC, 50 Hz, with a 25 kA breaking capacity certified to EN 60898 — meaning it clears high fault currents upstream without nuisance tripping on downstream branch circuits. The E tripping characteristic is the key differentiator: it's a selective (time-delayed) curve designed for main breaker duty, allowing downstream standard MCBs to clear faults first. Only if the fault persists beyond the delay does the 5SP3735-1 trip, keeping the rest of the board live during a branch fault. Conductor range accepts 2.5 mm² minimum up to 50 mm² maximum, covering standard distribution wiring from subfeed to main feeder. Saddle terminals are fitted, which grip the conductor firmly without damaging strands — a practical advantage over screw-only clamps when terminating larger cross-sections. Overvoltage category IV (pollution degree unspecified but standard for mains entrance) and 6 kV surge voltage resistance suit it for the service entrance position where direct lightning-induced surges are a real risk. Mounts on 35 mm standard DIN rail (standard rail per spec), or with accessories on busbar or screw fixing. The 3-pole unit occupies 6 width units (approx 108 mm on a standard DIN rail). Depth is 92 mm including enclosure — check gland plate depth if retrofitting into a shallow enclosure. Switch position indicator shows OFF = green, ON = red for quick visual status check during commissioning or troubleshooting.","metaTitle":"Siemens SENTRON 5SP3735-1 Selective MCB, 35A, 25kA, 3-Pole","metaDescription":"Siemens 5SP3735-1 SENTRON selective miniature circuit breaker, 35A rated current, 25kA breaking capacity per EN 60898, 3-pole, characteristic E. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Maximum":"50 mm²","Minimum":"2.5 mm²","Sealable":"Yes","Rated Value":"25 kA","Mounting type":"standard rail","Number of poles":"3","lifecycle_stage":"current","Saddle Terminals":"Yes","Shock resistance":"30 g, at least 3 impacts, impact duration 11 ms","Product brand name":"SENTRON","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","Overvoltage category":"IV","Design of the product":"Main miniature circuit breaker","Number of width units":"6","Number of poles / Note":"3P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Depth / of the enclosure":"92 mm","circuit-breaker / Design":"5SP3","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"35 A","Tripping characteristic class":"E","acc. to EN 60898 / rated value":"25 kA","Position / of power supply cord":"Any","Insulation voltage / rated value":"690 V","Supply voltage / at AC / rated value":"400 V","Supply voltage frequency / rated value":"50 Hz","Surge voltage resistance / rated value":"6 kV","Mounting type / other installation / Note":"With accessories on 35 mm standard mounting rail or busbar or screw fixing","Vibration resistance / acc. to IEC 60068-2-6":"2 g, 20 frequency cycles 5 to 150 to 15 Hz","Display version / for switch position indicator":"OFF = green, ON = red","Mechanical service life (switching cycles) / typical":"20 000"}},"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=320510&mlfb=5SP3735-1","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP3735-1/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SP3735-1?","answer":"Rated breaking capacity is 25 kA per EN 60898 at 400 V AC, suitable for main distribution positions with high prospective fault current."},{"question":"What conductor sizes does 5SP3735-1 accept?","answer":"Terminals accept 2.5 mm² minimum to 50 mm² maximum conductor cross-section, with saddle terminals for secure clamping."},{"question":"Where can I buy 5SP3735-1 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial automation distribution. Submit an RFQ for current availability and pricing — no stock or price figures are published here."},{"question":"What is the tripping characteristic E on this breaker?","answer":"Characteristic E is a selective (time-delayed) curve designed for main breaker duty. It delays tripping on overcurrent to allow downstream standard MCBs to clear branch faults first, improving supply continuity."},{"question":"Will 5SP3735-1 drop into a panel specified around 5SL6606-7YA?","answer":"No — 5SL6606-7YA is a 4-pole 6 A C-curve MCB in a different form factor (72 mm wide, 76 mm deep). The 5SP3735-1 is 3-pole, 35 A, E-curve, 92 mm deep, and occupies 6 width units. Panel rewiring and busbar reconfiguration would be required; these are not drop-in replacements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3735-1","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/5SP3735-1 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}}