{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1050-4ED42-0KC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1050-4ED42-0KC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1050-4ED42-0KC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1050-4ED42-0KC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA series, molded case circuit breaker, 3VA1050-4ED42-0KC0, 4-pole, 50 A rated current at 40 °C, breaking capacity 121 kA at 240 V, 75.6 kA at 415 V.","salesMarkdown":"The Siemens SENTRON 3VA1050-4ED42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C ambient and derating to 45 A at 70 °C — so in a warm enclosure you lose about 10 % of the headroom. The 121 kA breaking capacity at 240 V AC tells you it can safely interrupt a fault up to that level without upstream fuses or a larger breaker taking over; at 415 V the interrupting rating is still 75.6 kA, which covers most industrial distribution panels fed from a typical MV/LV transformer. That 101.6 mm (4-inch) width is the standard footprint for a 4-pole SENTRON 3VA frame — it occupies four 25.4 mm module positions on a DIN rail or panel-mount backplate. Verify the gland-plate cutout and busbar spacing against your existing panel layout; the depth of 70 mm leaves room for rear-connected busbars or a shunt-trip accessory. ## Built-in auxiliary and shunt trip The auxiliary switches report the breaker position back to a PLC or status lamp without adding a separate contact block.","metaTitle":"Siemens SENTRON 3VA1050-4ED42-0KC0 MCCB, 50 A, 4-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1050-4ED42-0KC0 molded case circuit breaker, 50 A rated, 4-pole, 121 kA breaking capacity at 240 V. Active production. Sourced 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":"0 A","Minimum":"0 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":"50 A","at 45 °C":"50 A","at 50 °C":"50 A","at 55 °C":"49 A","at 60 °C":"48 A","at 65 °C":"46 A","at 70 °C":"45 A","Depth [In]":"2.76 in","Width [In]":"4 in","Height [In]":"5.12 in","Trip Indicator":"No","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":"14.6 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA10504ED420AA0","Design Of The Auxiliary Switch":"2 auxiliary switches 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":"without","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":"No","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","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=502369&mlfb=3VA1050-4ED42-0KC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1050-4ED42-0KC0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1050-4ED42-0KC0?","answer":"Submit an RFQ through this listing. The part is sourced to order via independent distribution; availability and current pricing are confirmed at quote time — no stock count is held on this page."},{"question":"What is the breaking capacity of 3VA1050-4ED42-0KC0 at 415 V?","answer":"75.6 kA at 415 V AC. At 240 V it is 121 kA, at 440 V it is 52.5 kA, and at 500 V or 690 V it is 11.9 kA."},{"question":"Does this MCCB include a shunt trip or auxiliary switches?","answer":"Yes, it ships with a shunt trip release (STL) and two auxiliary switches HQ, factory-installed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1050-4ED42-0KC0","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/3VA1050-4ED42-0KC0 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}}