{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1110-4FD42-0KF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1110-4FD42-0KF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1110-4FD42-0KF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1110-4FD42-0KF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON series, 3VA1110-4FD42-0KF0, molded case circuit breaker, 4-pole, 50 A fixed rating, 121 kA breaking capacity at 240 V, shunt trip, auxiliary switch and trip alarm.","salesMarkdown":"Breaking capacity hits 121 kA at 240 V and stays at 75.6 kA at 415 V, dropping to 52.5 kA at 440 V and 11.9 kA at both 500 V and 690 V. The 50 A fixed rating means it's sized for a specific load — a 50 A motor branch, a 50 A feeder, or a 50 A distribution submain — and you don't have to worry about an operator dialing it up past the wire rating. ## Thermal derating — the real-world current you can carry At 55 °C it derates to 98 A, at 60 °C to 96 A, at 65 °C to 94 A, and at 70 °C to 91 A. If your load pulls 55 A continuous and the ambient hits 65 °C, you're still inside the 94 A derated limit — no nuisance trips from ambient alone. ## Built-in auxiliaries and accessories That means you get remote tripping capability and status feedback out of the box — no separate accessory kit to order and install. The shunt trip lets a PLC or safety relay drop the breaker on a fault or E-stop signal. The trip alarm switch changes state when the breaker trips on overcurrent, giving a discrete input to the control system. No undervoltage release is fitted, so if you need UVR protection for a motor starter interlock, you'll add it externally. No communication module either — this is a standalone line-protection breaker, not a power-monitoring node. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — a 4-pole MCCB that fits a standard distribution panel footprint. Power loss is 25 W maximum at rated current, which matters for thermal management in a sealed enclosure.","metaTitle":"Siemens 3VA1110-4FD42-0KF0 SENTRON MCCB, 50 A, 4-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1110-4FD42-0KF0 molded case circuit breaker. 50 A fixed rating, 4-pole, 121 kA breaking capacity at 240 V. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"101.6 mm","Height":"130 mm","Maximum":"50 A","Minimum":"50 A","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 kA","at 500 V":"11.9 kA","at 690 V":"11.9 kA","at 40 °C":"100 A","at 45 °C":"100 A","at 50 °C":"100 A","at 55 °C":"98 A","at 60 °C":"96 A","at 65 °C":"94 A","at 70 °C":"91 A","Depth [In]":"2.76 in","Width [In]":"4 in","Height [In]":"5.12 in","Trip Indicator":"Yes","Number Of Poles":"4","Voltage Trigger":"Yes","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"25 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA11104FD420AA0","Design Of The Auxiliary Switch":"1 auxiliary switch + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"shunt trip (STL)","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"TM210","Design Of Short-Circuit Protection":"For switching power values in DC networks, see the 3VA molded case circuit breaker device manual; link to be found under Service & Support in the last chapter","protection class IP / on the front":"IP40","design of the N-conductor protection":"50%","Of The Integrated Auxiliary Trip Unit":"3VA9688-0BL33","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching Capacity Class Of The Circuit Breaker":"S","Mechanical Service Life (Operating Cycles) / Typical":"20 000","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"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=405421&mlfb=3VA1110-4FD42-0KF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1110-4FD42-0KF0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1110-4FD42-0KF0 and how do I get a price?","answer":"This breaker is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 3VA1110-4FD42-0KF0 at different voltages?","answer":"121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V."},{"question":"What accessories are factory-fitted on this MCCB?","answer":"A shunt trip (STL) and one auxiliary switch plus one trip alarm switch (HQ) are included from the factory."},{"question":"Does this breaker have a communication module?","answer":"No — the communication function is not present. This is a standalone line-protection breaker without power monitoring or fieldbus connectivity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1110-4FD42-0KF0","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/3VA1110-4FD42-0KF0 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}}