{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP3240-3","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP3240-3","canonicalUrl":"https://aoctrl.com/siemens/5SP3240-3","factsUrl":"https://aoctrl.com/api/mcp/products/5SP3240-3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP3240-3, 2-pole miniature circuit breaker, E characteristic, 40 A rated current, 25 kA breaking capacity at 400 V AC, DIN rail mount.","salesMarkdown":"The Siemens 5SP3240-3 is a SENTRON main miniature circuit breaker — 2-pole, E tripping characteristic, rated 40 A at 400 V AC, 50 Hz. The E curve means it's built for selective coordination with upstream devices in residential and infrastructure panels, with a delayed trip that lets downstream MCBs clear a fault first. 40 A at 30 °C ambient, derated to 38 A at 40 °C and 35 A at 55 °C — so if this breaker lives in a hot enclosure or next to other heat-generating devices, factor that 5 A drop into your load calculation. Insulation voltage rated 690 V gives headroom above the 400 V operating level. It's a 2-pole breaker (2P design), so it switches both phase and neutral — common for single-phase final subcircuits in European residential and infrastructure panels where the neutral needs disconnection. Terminal capacity goes from 2.5 mm² up to 50 mm² solid or stranded — that's a wide clamping range for feeding through larger incoming cables. Saddle terminals are fitted, which grip the conductor firmly without damaging strands. Locking slide integrated into the housing accepts a padlock, wire seal, or cable tie for lockout/tagout.","metaTitle":"Siemens 5SP3240-3 SENTRON MCB, 40A 2P E-Curve, 25kA","metaDescription":"Siemens 5SP3240-3 SENTRON miniature circuit breaker. 40A, 2-pole, E-characteristic, 25 kA breaking capacity at 400 V. DIN rail mount, IP40. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76.3 mm","title":"5SP3240-3","Height":"128 mm","Maximum":"70 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"25 kA","description":"Main miniature circuit breaker (SHU), 2-pole, E 40, 400V","Solid Maximum":"50 mm²","Solid Minimum":"2.5 mm²","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"DIN rail","Saddle Terminals":"Yes","Shock Resistance":"30 g, at least 3 impacts, impact duration 11 ms","Stranded Maximum":"50 mm²","Stranded Minimum":"2.5 mm²","at AC rated value":"40 A","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP40, with connected conductors","Overvoltage Category":"IV","Design Of The Product":"Main miniature circuit breaker","at 30 °C rated value":"40 A","at 40 °C rated value":"38 A","at 45 °C rated value":"37 A","at 50 °C rated value":"36 A","at 55 °C rated value":"35 A","Depth Of The Enclosure":"76.3 mm","Fastening Method Other":"on DIN rail 35 mm acc. to EN 60715","Infeed At Box Terminal":"Yes","Suitability For Operation":"Residential buildings/infrastructure","Design Of The Locking Device":"Integrated locking slide, lockable by means of a lock, wire seal and cable ties","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"E","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"25 kA","insulation voltage (Ui) rated value":"690 V","Supply Voltage Frequency Rated Value":"50 Hz","Surge Voltage Resistance Rated Value":"6 kV","Display Version For Switch Position Indicator":"OFF = green, ON = red","vibration resistance according to IEC 60068-2-6":"2 g, 20 frequency cycles 5 to 150 to 15 Hz","Mechanical Service Life (Operating Cycles) Typical":"20 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"6.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a2a2c99d2cf45a2716838f8d64a60e98.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=420967&mlfb=5SP3240-3"},"ai":{"faq":[{"question":"What does the E tripping characteristic mean on this breaker?","answer":"The E curve is a delayed trip designed for selective coordination — it holds longer than a B or C curve under a short circuit, letting downstream breakers clear the fault first. That's useful at the main distribution point in residential and infrastructure panels where you want the branch MCB to trip before the main."},{"question":"What is the breaking capacity of the 5SP3240-3?","answer":"25 kA at 400 V AC per EN 60898. That's the maximum fault current it can safely interrupt at the rated voltage."},{"question":"Where can I buy the 5SP3240-3?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — submit an RFQ for a firm commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP3240-3","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/5SP3240-3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}