{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3446-6KK01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3446-6KK01","canonicalUrl":"https://aoctrl.com/siemens/5SM3446-6KK01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3446-6KK01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 5SM3446-6KK01, 4-pole Type A short-time delayed, 63 A at 400 V AC, DIN rail mount, 77 mm depth.","salesMarkdown":"The Siemens SENTRON 5SM3446-6KK01 is a 4-pole residual current circuit breaker (RCCB) rated 63 A at 400 V AC, 50 Hz. It's a Type A short-time delayed design — meaning it detects pulsating DC fault currents and rides through brief inrush events that would trip a standard instantaneous RCCB. That matters when you're protecting circuits with electronic loads like VFDs, UPS systems, or switching power supplies that leak a pulsed DC component to ground. Rated current holds at 63 A up to 45 °C ambient, then derates linearly: 59.22 A at 50 °C, 55.44 A at 55 °C, 51.66 A at 60 °C, 47.88 A at 65 °C, and 44.1 A at 70 °C. Surge current resistance is rated 1 kA; permissible I²t is 70 000 A²s. The short-circuit current rating is listed as 0 kA, which is standard for an RCCB — it relies on an upstream MCB or fuse to clear fault current. Install it downstream of a properly rated overcurrent device. Snaps onto DIN rail (REG mount). Occupies 4 width units — 72 mm wide, 90 mm tall, 77 mm deep with 70 mm installation depth. That 77 mm depth is the dimension you check against gland-plate clearance or a shallow enclosure back wall. Mounting position is any orientation; feed from top or bottom. Terminals accept solid or stranded copper from 1.5 mm² up to 25 mm² — covers the range from a 2.5 mm² lighting circuit tail up to a 16 mm² feeder for a submain. Protection against electric shock is finger and back-of-hand safe (IP20 touch-safe terminals). The closest functional peer in the SENTRON family is the 5SY4304-7CV — a 4-pole MCB, not an RCCB. They share the 4-MW DIN footprint and 72 mm width, but the 5SY provides overcurrent protection only. The 5SM3446-6KK01 adds Type A residual current detection and short-time delay. You can't drop one in for the other without rewiring the circuit protection scheme.","metaTitle":"5SM3446-6KK01 SENTRON RCCB, 63 A, 400 V, 4-pole, Type A, sho","metaDescription":"Siemens SENTRON 5SM3446-6KK01 RCCB, 63 A rated, 400 V AC, 4-pole, Type A, short-time delayed. Current lifecycle stage. Sourced to order against RFQ. Depth 77 mm, DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","at 40 Cel":"63 A","at 45 Cel":"63 A","at 50 Cel":"59.22 A","at 55 Cel":"55.44 A","at 60 Cel":"51.66 A","at 65 Cel":"47.88 A","at 70 Cel":"44.1 A","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","During Storage":"-40 ... +75 °C","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","Operating frequency":"50Hz","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Design of the product":"Short-time delayed","Number of width units":"4","Type of fault current":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM3","Short-circuit current rating":"0 kA","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Supply voltage / at AC / rated value":"400 V","Surge current resistance / rated value":"1 kA","Switching function / short-term delayed":"Yes","Tripping residual current / rated value":"100 mA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Size of installation devices / acc. to DIN 43880":"1","Supply voltage / for testing equipment / minimum":"100 V","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=141441&mlfb=5SM3446-6KK01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3446-6KK01/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3446-6KK01 and how do I get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"When sourcing 5SM3446-6KK01, what's the closest functional second-source — 5SY4304-7CV?","answer":"The 5SY4304-7CV is a 4-pole MCB sharing the same DIN footprint and width, but it provides overcurrent protection only — no residual current detection. It is not a functional second-source for the RCCB function."},{"question":"What is 5SM3446-6KK01's listed depth?","answer":"The depth is 77 mm, with 70 mm installation depth into the panel."},{"question":"What conductor sizes does 5SM3446-6KK01 accept?","answer":"Solid or stranded copper from 1.5 mm² up to 25 mm²."},{"question":"Will 5SM3446-6KK01 drop into a panel specified around 5SY4304-7CV without rewiring?","answer":"No. Both are 4 MW DIN-rail devices with the same width, but the 5SM3446-6KK01 is an RCCB requiring a neutral connection for residual current sensing and must be paired with upstream overcurrent protection. The circuit topology differs from an MCB-only layout."},{"question":"What compliance documentation does Siemens provide for 5SM3446-6KK01?","answer":"The RCCB carries a silicon-free product feature and is designed to DIN EN 61346-2 and DIN EN 81346-2 standards. Specific RoHS, REACH, UL, or IEC declarations should be requested at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3446-6KK01","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/5SM3446-6KK01 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}}