{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4318-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4318-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4318-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4318-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series miniature circuit breaker, 5SJ4318-8HG42, 3-pole, D-curve, 15 A, 10 kA (UL 489) / 15 kA (IEC 60947-2), 70 mm depth, 54 mm width, 121 mm height.","salesMarkdown":"## D-curve 15 A — what the ratings mean for the panel The 5SJ4318-8HG42 is a 3-pole miniature circuit breaker from the Siemens SENTRON 5SJ4 family, with a D tripping characteristic and a 15 A continuous rating. The D-curve (10–20× In magnetic trip) is designed for loads with high inrush current — motor starters, small drives, transformers, or welding equipment — where a B or C curve would nuisance-trip on startup. It carries dual interrupting ratings: 10 kA per UL 489 at 480Y/277 V, and 15 kA per IEC 60947-2 at 400 V AC. For a panel built to UL 508A, the 10 kA SCCR at 277/480 V is the number that governs the branch-circuit protection — make sure the upstream fault current doesn't exceed that ceiling. ## Mounting and fit — DIN rail, 3-module width Snaps onto standard 35 mm DIN rail (EN 60715). Width is 54 mm (3 modular units at 18 mm each), depth 70 mm, height 121 mm. The 70 mm installation depth leaves room in a shallow enclosure — typical 80 mm deep panels clear it with 10 mm to spare. ## Environmental range and approvals Ambient operating range is -40 °C to +75 °C with up to 95 % humidity — wide enough for unheated warehouses, outdoor enclosures, or plant floors near ovens. Protection is IP20 with conductors connected, IP40 in the handle area; not rated for washdown or wet locations. Overvoltage category III, pollution degree 3 — suited for fixed installations in industrial environments where transient overvoltages and conductive dust are present. Vibration resistance tested at 50 m/s² (25–150 Hz) and 60 m/s² at 35 Hz.","metaTitle":"Siemens 5SJ4318-8HG42 SENTRON MCB, 3P D 15 A, 10 kA UL 489","metaDescription":"Siemens SENTRON 5SJ4318-8HG42 miniature circuit breaker, 3-pole, D-curve, 15 A, 10 kA UL 489 / 15 kA IEC 60947-2. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"54 mm","title":"5SJ4318-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 3-pole, D, 15 A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","protection class IP":"IP20, with connected conductors, IP 40 in the handle range","Overvoltage Category":"3","Tunnel Terminals Top":"No","Vibration Resistance":"50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","Combined Terminal Top":"Yes","Design Of The Product":"Miniature circuit-breaker 5SJ4","Product Function Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","at DC rated value maximum":"60 V","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"10 kA","Ambient Temperature During Operation":"max. 95% humidity","Supply Voltage Frequency Rated Value":"50 Hz","according to IEC 60947-2 rated value":"15 kA","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","insulation voltage (Ui) at AC rated value":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","vibration resistance according to IEC 60068-2-6":"±1 mm at 5 to 25 Hz; 50 m/s² at 25 to 150 Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","Tightening Torque With Screw-Type Terminals Maximum":"3.5 N·m","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$123.19 – $353.94","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3ce70b217ab5e92db7cb6aedd28e4d17.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=45713&mlfb=5SJ4318-8HG42"},"ai":{"faq":[{"question":"What compliance documentation does the 5SJ4318-8HG42 carry?","answer":"The breaker is UL 489 listed (10 kA at 480Y/277 V) and rated per IEC 60947-2 (15 kA at 400 V). It is halogen-free and silicon-free. The product brand is Siemens SENTRON. Full RoHS/REACH declarations are available from the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4318-8HG42","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/5SJ4318-8HG42 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}}