{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4311-7HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4311-7HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4311-7HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4311-7HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker 5SJ4311-7HG42, 3-pole, 5 A rated at 30/40 °C, 3 modular width units, IP20/IP40.","salesMarkdown":"## What it is and what it does The Siemens 5SJ4311-7HG42 is a SENTRON miniature circuit breaker (MCB) from the 5SJ4 series, designed for branch-circuit overcurrent protection in industrial control panels and distribution boards. Its 3-pole construction and 5 A rated current at 30 °C and 40 °C make it a fit for lighting, small motor, or control-transformer circuits where the load current sits at or below 5 A per phase. The 3-modular-width footprint — 54 mm wide — snaps onto standard DIN rail in any mounting position, so it integrates into existing panel layouts without re-drilling or adapter plates. ## Ratings that matter for fit The 5 A rating holds at 30 °C and 40 °C ambient, then derates to 4.9 A at 45 °C, 4.8 A at 50 °C, 4.6 A at 55 °C, and 4.5 A at 60 °C (–). If your panel runs hot — say, a sealed enclosure near a motor — the effective trip threshold drops; size the breaker for the actual ambient, not the nameplate. The DC rating maxes at 60 V, so it can handle a 48 VDC control bus but not a 125 VDC battery bank. Overvoltage category III and pollution degree 3 mean it's rated for fixed-installation mains with non-conductive dust and occasional condensation — typical for industrial switchgear, not clean-room electronics.","metaTitle":"Siemens 5SJ4311-7HG42 SENTRON MCB, 3-Pole 5 A, 3 MW","metaDescription":"Siemens 5SJ4311-7HG42 SENTRON miniature circuit breaker, 3-pole, 5 A rated, 3 modular width units. IP20/IP40. Current production. Sourced to order against RFQ.","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":"5SJ4311-7HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 3-pole, C, 5A 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":"5 A","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","at 30 °C rated value":"5 A","at 40 °C rated value":"5 A","at 45 °C rated value":"4.9 A","at 50 °C rated value":"4.8 A","at 55 °C rated value":"4.6 A","at 60 °C rated value":"4.5 A","Tunnel Terminals Bottom":"No","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","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":"C","supply voltage at AC rated value":"400 V","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)","Type Of Voltage Of The Operating Voltage":"AC/DC","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 (Switching 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":"2.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$129.54","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/46d9cc450377f6a91470c6196ca9bdef.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=194553&mlfb=5SJ4311-7HG42"},"ai":{"faq":[{"question":"Where can I buy 5SJ4311-7HG42 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 5SJ4311-7HG42 drop into a panel that was specified around 5SY4310-7CV without rewiring?","answer":"Both are 3-pole MCBs on standard DIN rail, but the 5SY4310-7CV is a different series with different trip characteristics and ratings. The 5SJ4311-7HG42 is a 5 A, 3-module-width breaker; verify the existing panel's ampacity and coordination study before swapping — the footprint fits, but the electrical fit depends on the circuit's fault current and load profile."},{"question":"What compliance documentation does Siemens provide for 5SJ4311-7HG42?","answer":"The part is halogen-free and silicon-free, and Siemens provides RoHS and REACH declarations for the SENTRON 5SJ4 series. The product designation follows EN 61346-2 and IEC 81346-2 function code F."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4311-7HG42","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/5SJ4311-7HG42 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}}