{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2040-5HM42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2040-5HM42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2040-5HM42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2040-5HM42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2 series molded case circuit breaker, 3VA2040-5HM42-0AA0, 4-pole, 40 A rated, adjustable thermal-magnetic trip 16–40 A, 187 kA breaking capacity at 240 V AC, line protection design.","salesMarkdown":"Rated 40 A continuous with a thermal-magnetic trip adjustable from 16 A to 40 A, it clears faults at 187 kA at 240 V AC, dropping to 121 kA at 415/440 V and 75.6 kA at 500 V. ## Trip adjustment and ground-fault monitoring The thermal-magnetic trip unit is field-adjustable via the rotary dial on the front face — set it anywhere between 16 A and 40 A in discrete steps. This lets you match the breaker to the actual continuous load without swapping the entire unit. The ground-fault monitoring version uses summation current formation on L + N conductors, meaning it measures vector sum of phase and neutral currents to detect leakage to earth. The 3VA2040-5HM42-0AA0 measures 140 mm wide, 181 mm tall, and 86 mm deep — a 4-pole frame that occupies the same footprint as other 3VA2 4-pole breakers in the 40 A class. That is unusual for a thermal-magnetic MCCB; many competitors start derating above 40 °C.","metaTitle":"Siemens 3VA2040-5HM42-0AA0 SENTRON MCCB, 40 A, 4-Pole, 187 k","metaDescription":"Siemens SENTRON 3VA2040-5HM42-0AA0 molded case circuit breaker, 40 A rated, 4-pole, adjustable 16–40 A thermal-magnetic trip, 187 kA breaking at 240 V. Active production. Quoted to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"86 mm","Width":"140 mm","Height":"181 mm","Maximum":"480 A","Minimum":"60 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":"3 kA","at 40 °C":"40 A","at 45 °C":"40 A","at 50 °C":"40 A","at 55 °C":"40 A","at 60 °C":"40 A","at 65 °C":"40 A","at 70 °C":"40 A","Depth [In]":"3.39 in","Width [In]":"5.51 in","Height [In]":"7.13 in","Initial Value":"16 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Full-Scale Value":"40 A","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":"2.2 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Continuous Current / Rated Value":"40 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU330","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 100%","Product Function / Grounding Protection":"Yes","operating voltage / at AC / rated value":"690 V","reference code / according to IEC 81346-2":"Q","Continuous Current / Rated Value / Maximum":"100 A","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"M","Mechanical Service Life (Operating Cycles) / Typical":"25 000","Type Of Electrical Connection / For Main Current Circuit":"on both sides nut keeper kit","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$369.57","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9fc4e4f6019ab02b3422c9676e426bf2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=443850&mlfb=3VA2040-5HM42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2040-5HM42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA2040-5HM42-0AA0 and how do I get a price?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ through this listing."},{"question":"When sourcing 3VA2040-5HM42-0AA0, what's the closest functional second-source — 3VA2040-8HN42-0AA0?","answer":"The 3VA2040-8HN42-0AA0 is the closest sibling in the same frame size and current rating. The key difference is the trip unit: the -5HM42-0AA0 uses a thermal-magnetic trip, while the -8HN42-0AA0 uses an electronic trip unit with additional adjustability and communication options. Both share the same 140 mm width, 181 mm height, and 86 mm depth, so they drop into the same panel footprint without rewiring."},{"question":"What is 3VA2040-5HM42-0AA0's listed depth (86 mm) on this component line?","answer":"The listed depth is 86 mm (3.39 in), which is standard for the 3VA2 4-pole frame at this rating."},{"question":"What is 3VA2040-5HM42-0AA0's listed width (140 mm) on this component line?","answer":"The listed width is 140 mm (5.51 in), matching the 4-pole frame width across the 3VA2 series."},{"question":"Will 3VA2040-5HM42-0AA0 drop into a panel that was specified around 3VA2040-8HN42-0AA0 without rewiring?","answer":"Yes — both breakers share the same 140 mm width, 181 mm height, and 86 mm depth, and both are 4-pole. The mounting footprint and terminal positions are identical, so no busbar or wiring changes are needed. The only difference is the trip technology (thermal-magnetic vs. electronic), which affects protection curve adjustability but not physical fit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2040-5HM42-0AA0","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/3VA2040-5HM42-0AA0 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}}