{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4230-7HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4230-7HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4230-7HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4230-7HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4230-7HG42, 2-pole miniature circuit breaker, C-curve, 30 A rated at 40 °C, 36 mm width, 70 mm depth, DIN-rail mount.","salesMarkdown":"## 2-pole, 30 A C-curve — what it means on the line This 5SJ4230-7HG42 is a 2-pole MCB from the Siemens SENTRON series, with a C-curve trip characteristic and a 30 A rating at 40 °C ambient. The C-curve means it holds through mild inrush — typical for motor starters, contactor coils, and small transformer loads — then trips fast on hard shorts. At 30 A, it's sized for a 7.5 kW motor at 400 V three-phase or a cluster of smaller loads on a subfeed. ## DIN-rail fit and panel space The breaker snaps onto standard 35 mm DIN rail and takes up 36 mm (2 modular width units). Depth is 70 mm — the same as most SENTRON 5SJ4 breakers — so it lines up with adjacent units on the rail. Mounting position is any orientation, which helps when you're packing a tight enclosure. ## Temperature derating — what the numbers show Rated current holds at 30 A up to 40 °C ambient. Above that it steps down: 29.1 A at 45 °C, 28.5 A at 50 °C, 27.8 A at 55 °C, and 27 A at 60 °C. If your panel internal temperature runs warm — say next to a drive or transformer — factor in the derating so the breaker doesn't nuisance-trip on a hot day. ## Vibration, sealing, and materials Rated for vibration up to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 sec), so it holds up on machine-mounted subpanels. IP20 with conductors connected, IP40 in the handle area — enough for enclosed industrial use but not washdown. The breaker is sealable, halogen-free, and silicon-free, which matters for food, pharma, or clean-room panels where outgassing or contamination is a concern.","metaTitle":"Siemens 5SJ4230-7HG42 2-Pole MCB, C-Curve 30 A, 36 mm","metaDescription":"Siemens SENTRON 5SJ4230-7HG42 2-pole MCB, C-curve, 30 A at 40 °C, 36 mm wide, 70 mm deep. Active production — quoted to order against your BOM. Request an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"36 mm","title":"5SJ4230-7HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 2-pole, C, 30 A according to UL 489-480Y/277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","at AC / rated value":"30 A","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","according to EN 61346-2":"F","at 30 °C / rated value":"30 A","at 40 °C / rated value":"30 A","at 45 °C / rated value":"29.1 A","at 50 °C / rated value":"28.5 A","at 55 °C / rated value":"27.8 A","at 60 °C / rated value":"27 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"60 V","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","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)","Type Of Voltage / Of The Operating Voltage":"AC/DC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","insulation voltage (Ui) / at AC / rated value":"440 V","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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$241.34","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a891f6ea5d7415453bbb0a20b2f72a36.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=12579&mlfb=5SJ4230-7HG42"},"ai":{"faq":[{"question":"Where can I buy the 5SJ4230-7HG42 and get a price?","answer":"We source the 5SJ4230-7HG42 through authorized Siemens distribution and quote it to order against your BOM. Send us an RFQ with your quantity and target delivery window — we'll confirm availability and current pricing. No stock-holding claim; the quote is firm at time of issue."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4230-7HG42","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/5SJ4230-7HG42 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}}