{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3732-1","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3732-1","canonicalUrl":"https://aoctrl.com/siemens/5SP3732-1","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3732-1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3 series, selective miniature circuit breaker (MCB), 5SP3732-1, 3-pole, 32 A, 25 kA breaking capacity, E tripping characteristic, 400 V AC, 50 Hz.","salesMarkdown":"## SENTRON 5SP3732-1 selective MCB — 32 A, 25 kA, E characteristic The Siemens 5SP3732-1 is a SENTRON 5SP3 series selective miniature circuit breaker (MCB) rated 32 A at 400 V AC, 50 Hz, with a 25 kA breaking capacity per EN 60898. The E tripping characteristic means it's designed for selectivity — it delays tripping on high inrush currents so that downstream MCBs clear the fault first, keeping this breaker closed and the rest of the distribution board live. Rated 32 A continuous at 400 V AC — sized for a main incomer or sub-feed in a residential or infrastructure distribution board, not for final branch circuits. The 25 kA breaking capacity (Icn) per EN 60898 means it can handle high prospective fault currents typical at the service entrance. Overvoltage category IV confirms it's rated for the utility-side of the installation, not just downstream equipment. The E characteristic is the key differentiator: it's a selective (time-delayed) trip curve that coordinates with downstream MCBs so only the faulted circuit opens. That's the whole point of the 5SP3 series — you use it as the main breaker in a selective distribution scheme. Conductor cross-section range is 2.5 mm² minimum to 50 mm² maximum, with saddle terminals. That 50 mm² top end is generous for a 32 A breaker — it lets you land the incoming feeder cable without a separate terminal adapter. The 3-pole construction (3P) with 6 width units means it occupies six 18 mm module positions on the DIN rail — plan for that footprint in the distribution board layout. ## Where it's used — selective distribution This is a main miniature circuit breaker (SHU — Selective Hauptsicherungsautomat) designed for the incoming supply position in residential buildings and infrastructure installations. The selective trip characteristic ensures that when a downstream MCB trips on a fault, this main breaker stays closed — keeping power to the rest of the board. That's critical for lighting, common areas, and essential circuits in apartment blocks, schools, or small commercial buildings where you don't want a single fault killing the whole supply.","metaTitle":"Siemens 5SP3732-1 SENTRON Selective MCB, 32A 25kA 3P","metaDescription":"Siemens 5SP3732-1 SENTRON selective miniature circuit breaker, 32 A, 25 kA breaking capacity at 400 V AC, 3-pole, E characteristic. Currently in 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":"32 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=90465&mlfb=5SP3732-1","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP3732-1/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SP3732-1 used for?","answer":"It's a selective main miniature circuit breaker (MCB) used at the incoming supply position in residential and infrastructure distribution boards. Its E tripping characteristic delays tripping so downstream MCBs clear faults first, keeping the main supply live to the rest of the board."},{"question":"What are the key ratings of the 5SP3732-1?","answer":"Rated current 32 A at 400 V AC, 50 Hz. Breaking capacity 25 kA per EN 60898. 3-pole, E tripping characteristic. Conductor cross-section 2.5 mm² to 50 mm². Overvoltage category IV. Surge voltage resistance 6 kV."},{"question":"Where can I buy the 5SP3732-1?","answer":"The 5SP3732-1 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3732-1","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/5SP3732-1 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}}