{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SN6303-8CP","brand":"Siemens","brandSlug":"siemens","productSlug":"5SN6303-8CP","canonicalUrl":"https://aoctrl.com/siemens/5SN6303-8CP","factsUrl":"https://aoctrl.com/api/mcp/products/5SN6303-8CP","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SN series, MCB 5SN6303-8CP, 3-pole, C-curve, 400 V AC, 50 Hz, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 72 V DC max.","salesMarkdown":"## 3-pole C-curve MCB for 400 V AC distribution The Siemens 5SN6303-8CP is a 3-pole miniature circuit breaker from the SENTRON 5SN series, rated for 400 V AC at 50 Hz with a C-curve tripping characteristic. The 72 V DC maximum rating means it can also protect DC control circuits up to that voltage, though the primary application is AC branch circuit protection. The dual breaking capacity rating is the key spec for a site electrical engineer coordinating a panel. The 30 kA per IEC 60947-2 gives headroom for industrial distribution where upstream transformers can deliver higher fault current — this MCB can be applied downstream of a 30 kA-rated main breaker without cascading failure, provided the let-through energy is coordinated. Accepts solid conductors up to 35 mm². Ambient range -40 to 75 °C. Power loss 1.2 W per pole.","metaTitle":"Siemens 5SN6303-8CP MCB 3-pole C-curve 400 V 50 Hz, 6/30 kA","metaDescription":"Siemens 5SN6303-8CP MCB 5SN series, 3-pole, C-curve, 400 V AC, 50 Hz, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 72 V DC max, -40 to 75 °C. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SN6303-8CP","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","description":"MCB 5SN","Number Of Poles":"3","lifecycle_stage":"current","Installation Depth":"70 mm","at DC rated value maximum":"72 V","Number Of Modular Width Units":"3","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"6 kA","Supply Voltage Frequency Rated Value":"50 Hz","according to IEC 60947-2 rated value":"30 kA","with multi-phase operation at AC maximum":"440 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","Connectable Conductor Cross-Section Solid Maximum":"35 mm²","Mechanical Service Life (Operating Cycles) Typical":"10 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8702792fe82ed5de796db7a7ac73a687.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1647274&mlfb=5SN6303-8CP"},"ai":{"faq":[{"question":"Will 5SN6303-8CP drop into a panel specified around 5SY4304-7CV without rewiring?","answer":"Yes, the dimensions are identical: 76 mm depth, 54 mm width (3 modular units), 90 mm height. The conductor cross-section limit (35 mm² solid) and mounting position (any) are the same. No rewiring is needed for a direct swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SN6303-8CP","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/5SN6303-8CP 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}}