{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1340-4EF32-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1340-4EF32-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1340-4EF32-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1340-4EF32-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1340-4EF32-0AF0, molded case circuit breaker, 3-pole, 400 A (at 40 °C), line protection version with TM240 overcurrent release, 121 kA breaking capacity at 240 V.","salesMarkdown":"## What it is and what it does The Siemens 3VA1340-4EF32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, meaning its primary job is to protect cables and busbars from overloads and short circuits in a distribution panel — not motor protection, which requires a different trip curve. It carries a continuous current rating of 400 A at 40 °C, and that figure holds steady up to 50 °C before derating begins — at 55 °C it's still good for 392 A, at 70 °C it drops to 367 A, so the thermal margin is generous for most panel environments. The TM240 overcurrent release is a thermal-magnetic type — the thermal element handles overloads, the magnetic element handles short circuits — tuned for line protection duty, not motor starting. ## Breaking capacity — what the ratings mean for your fault level Breaking capacity is the maximum fault current the breaker can safely interrupt without welding contacts or rupturing the case. This MCCB delivers 121 kA at 240 V, 76 kA at 415 V and 440 V, 53 kA at 500 V, and 10.5 kA at 690 V — so it handles high available fault currents at the lower voltages common in North American and some European distribution, while the 690 V figure still covers most industrial service-entrance requirements. Rated insulation voltage is 800 V, which means the internal clearances and creepage distances are designed for systems up to that level — the 690 V breaking capacity is the practical limit for a fault interruption, but the insulation path is rated higher. ## Lifecycle and sourcing reality The auxiliary contact configuration is 1 auxiliary switch + 1 trip alarm switch (HQ version), which gives you both a status mirror and a separate alarm contact for remote fault indication — useful for PLC or SCADA integration without adding external relays. Power loss at rated current is 92.1 W maximum — factor that into your panel thermal budget, especially if the breaker is enclosed or mounted in a densely packed switchboard. ## Panel fit and integration Dimensions are 248 mm high, 138 mm wide, 110 mm deep. Depth of 110 mm fits most enclosures with room for rear cable access. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.","metaTitle":"Siemens 3VA1340-4EF32-0AF0 SENTRON MCCB, 400 A, 3-Pole, Line","metaDescription":"Siemens 3VA1340-4EF32-0AF0 SENTRON molded case circuit breaker, 400 A rated at 40 °C, 3-pole, line protection version with TM240 release. Breaking capacity 121 kA at 240 V. Current","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"110 mm","Width":"138 mm","Height":"248 mm","at 240 V":"121 kA","at 415 V":"76 kA","at 440 V":"76 kA","at 500 V":"53 kA","at 690 V":"10.5 kA","at 40 °C":"400 A","at 45 °C":"400 A","at 50 °C":"400 A","at 55 °C":"392 A","at 60 °C":"384 A","at 65 °C":"376 A","at 70 °C":"367 A","Depth [In]":"4.3 in","Width [In]":"5.4 in","Height [In]":"9.8 in","Trip Indicator":"Yes","Number Of Poles":"3","Product version":"Line protection","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"92.1 W","Auxiliary contact version":"1 auxiliary switch + 1 trip alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA13404EF320AA0","Courant permanent assigné Iu":"400 A","Design Of The Auxiliary Release":"without auxiliaryrelease","Ground-Fault Monitoring Version":"Without","Tension assignée d'isolement Ui":"800 V","Design Of The Overcurrent Release":"TM240","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","reference code / acc. to IEC 81346-2":"Q","Max. rated operational voltage Ue with DC":"500 V","Undervoltage Release With Leading Contact":"No","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / lg min.":"400 A","Adjustable response value current / li max.":"4 000 A","Adjustable response value current / li min.":"2 000 A","Neutral conductors / upgradeable/retrofittable":"No","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","Max. rated operational current of the frame size":"400 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Mechanical Service Life (Switching Cycles) / Typical":"15 000","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f59d8c360c846d5ff9ef773daebb7908.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1419417&mlfb=3VA1340-4EF32-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1340-4EF32-0AF0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1340-4EF32-0AF0","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/3VA1340-4EF32-0AF0 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}}