{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1440-5MH32-0BC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1440-5MH32-0BC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1440-5MH32-0BC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1440-5MH32-0BC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1440-5MH32-0BC0, molded case circuit breaker, 3-pole, 400 A, breaking capacity 187 kA at 240 VAC, 121 kA at 415 VAC, with undervoltage release and 2 auxiliary switches HQ.","salesMarkdown":"The Siemens SENTRON 3VA1440-5MH32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated at 400 A continuous, with a maximum breaking capacity of 187 kA at 240 VAC — that's the short-circuit current it can safely interrupt at that voltage without welding contacts or rupturing the case. At 415 VAC the interrupting rating drops to 121 kA, and at 690 VAC it's 11.9 kA, so the voltage at the fault point determines whether this breaker clears a high-fault event or needs an upstream device to take over. The 400 A rating holds from 40 °C up to 50 °C; above that it derates to 392 A at 55 °C and 367 A at 70 °C, which matters when the breaker sits in a crowded enclosure with other heat sources. This MCCB is designed specifically for starter protection — meaning it's built to coordinate with motor starters and contactors, providing both overload and short-circuit protection for motor branch circuits. ## Built-in auxiliaries and releases — what's inside the case No communication function is built in, so remote trip monitoring requires wiring the aux contacts to an I/O module. The 3-pole design with 400 A frame means it occupies the same mounting space as other 400 A SENTRON breakers; no special adapter plate needed for a typical MCC bucket or distribution panel.","metaTitle":"Siemens 3VA1440-5MH32-0BC0 SENTRON MCCB, 400 A, 187 kA at 24","metaDescription":"Siemens SENTRON 3VA1440-5MH32-0BC0 molded case circuit breaker, 400 A, 3-pole, 187 kA breaking capacity at 240 VAC. 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":"110 mm","Width":"138 mm","Height":"248 mm","Maximum":"400 A","Minimum":"400 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"121 kA","at 500 V":"75.6 kA","at 690 V":"11.9 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]":"4.33 in","Width [In]":"5.43 in","Height [In]":"9.76 in","Trip Indicator":"No","Number Of Poles":"3","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"Yes","Design Of The Product":"Starter protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"79.3 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA14405MH320AA0","Design Of The Auxiliary Switch":"2 auxiliary switches HQ","Design Of The Auxiliary Release":"undervoltage release (UVR)","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"TM120M","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","Of The Integrated Auxiliary Trip Unit":"3VA9608-0BB11","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"I","number of CO contacts / for auxiliary contacts":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching Capacity Class Of The Circuit Breaker":"M","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=1389410&mlfb=3VA1440-5MH32-0BC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1440-5MH32-0BC0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1440-5MH32-0BC0 at different voltages?","answer":"At 240 VAC it's 187 kA, at 415 VAC and 440 VAC it's 121 kA, at 500 VAC it's 75.6 kA, and at 690 VAC it's 11.9 kA. The interrupting rating decreases as voltage increases, so the available fault current at the installation point must be checked against the appropriate voltage column."},{"question":"Where can I buy the 3VA1440-5MH32-0BC0 and what is the lead time?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price."},{"question":"Does the 3VA1440-5MH32-0BC0 include an undervoltage release?","answer":"Yes, it comes with a factory-installed undervoltage release (UVR) plus two HQ auxiliary switches. The UVR trips the breaker when control voltage drops, and the aux switches provide open/closed status."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1440-5MH32-0BC0","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/3VA1440-5MH32-0BC0 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}}