{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1050-2ED42-0KC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1050-2ED42-0KC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1050-2ED42-0KC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1050-2ED42-0KC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1050-2ED42-0KC0, Molded case circuit breaker, 4-pole, 50 A, TM210 trip unit, line protection, with shunt trip (STL) and 2 auxiliary switches HQ.","salesMarkdown":"It's a line-protection device — meaning it guards distribution feeders and branch circuits against overload and short circuit, not motor-protection curves. With the shunt trip (STL) accessory factory-installed (order code 3VA9688-0BL33), this breaker can be remotely tripped from an emergency-stop circuit or a PLC digital output. The 2 auxiliary switches HQ provide status feedback — closed/ tripped — back to a control system or annunciator panel. ## Breaking capacity — the so-what for selectivity This breaker delivers 52.5 kA at 240 VAC, 32 kA at 415 VAC, 13.6 kA at 440 VAC, and 7.5 kA at 690 VAC. Those numbers govern whether it coordinates with an upstream feeder breaker or transformer. At 415 V, 32 kA is enough for most secondary switchboards downstream of a 1 MVA transformer; at 690 V, the 7.5 kA figure means it's suited for lower-fault industrial loads, not high-fault mining or marine distribution. The 50 A frame at 40–50 °C is fully rated — no derating until 55 °C, where it drops to 48 A, then 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. That thermal curve lets you push the breaker into a warm enclosure as long as ambient stays under 50 °C. ## Mechanical endurance and environmental limits Rated for 15,000 mechanical operations — that's typical for a distribution breaker that sees infrequent switching, not a contactor duty cycle. Dimensions: 130 mm height, 101.6 mm width, 70 mm depth — fits standard 4-pole MCCB panel cutouts.","metaTitle":"Siemens 3VA1050-2ED42-0KC0 SENTRON MCCB, 50 A, 4-Pole, Line","metaDescription":"Siemens 3VA1050-2ED42-0KC0 SENTRON molded case circuit breaker, 50 A rated, 4-pole, 52.5 kA at 240 VAC. Active production, sourced to order. RFQ for pricing and availability.","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","at 240 V":"52.5 kA","at 415 V":"32 kA","at 440 V":"13.6 kA","at 690 V":"7.5 kA","at 40 °C":"50 A","at 45 °C":"50 A","at 50 °C":"50 A","at 55 °C":"48 A","at 60 °C":"47 A","at 65 °C":"46 A","at 70 °C":"45 A","Trip indicator":"No","Number of poles":"4","Product version":"Line protection","Voltage trigger":"Yes","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"No","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"2 auxiliary switches HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"50 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Shunt trip (STL)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9688-0BL33","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","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"1","Adjustable response value time / tr min.":"1","Max. rated operational voltage Ue with DC":"600 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"No","Adjustable response value current / Ir max.":"50 A","Adjustable response value current / li max.":"500 A","Adjustable response value current / li min.":"500 A","Adjustable response value current / lr min.":"50 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"2","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching capacity class of the circuit breaker":"B","Max. rated operational current of the frame size":"100 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"lug terminal","Arrangement of electrical connectors / for main current circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"17 x 6.5","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"12 x 0"}},"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=225234&mlfb=3VA1050-2ED42-0KC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1050-2ED42-0KC0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at 415 V?","answer":"At 415 VAC, the 3VA1050-2ED42-0KC0 is rated for 32 kA. That's suitable for secondary distribution downstream of a typical 1 MVA transformer."},{"question":"Does this breaker include a shunt trip?","answer":"Yes, the design of the auxiliary release is a shunt trip (STL), factory-integrated with the order code 3VA9688-0BL33. It allows remote tripping from an E-stop or PLC output."},{"question":"Where can I buy the 3VA1050-2ED42-0KC0?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the thermal derating above 50 °C?","answer":"At 55 °C the rated current drops to 48 A, at 60 °C to 47 A, at 65 °C to 46 A, and at 70 °C to 45 A (–). Below 50 °C it holds the full 50 A rating (–)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1050-2ED42-0KC0","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/3VA1050-2ED42-0KC0 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}}