{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-5MH32-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-5MH32-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-5MH32-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5MH32-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-5MH32-0AA0, molded case circuit breaker, 3-pole, 20 A rated current, 187 kA breaking capacity at 240 V, starter protection design, TM120M overcurrent release.","salesMarkdown":"Three poles, rated 20 A continuous at 40 °C through 55 °C, and derated to 19 A at 60 °C through 70 °C. That flat thermal curve from 40 °C to 55 °C is unusual and useful: you get full 20 A rating across the typical panel ambient range without having to oversize the frame. The headline number here is the breaking capacity: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at 500 V and 690 V. At 415 V the 121 kA still covers most heavy industrial installations. The drop to 7.5 kA at 500 V and 690 V is the limit for higher-voltage motor circuits; if your system runs at 690 V, verify the available fault current stays under that threshold. The overcurrent release is a TM120M — thermal-magnetic, fixed-trip type. The '120M' designation means the magnetic short-circuit pickup is fixed at 120 A (6× the 20 A rating). That fixed magnetic setting is typical for starter protection: it allows motor inrush without nuisance tripping but still clears a bolted fault fast. Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth. Power loss is 12 W maximum at rated current. That is moderate for a 20 A MCCB; factor it into the enclosure thermal budget if you are packing multiple breakers in a small panel.","metaTitle":"Siemens 3VA1120-5MH32-0AA0 MCCB, 3-pole, 20 A, 187 kA at 240","metaDescription":"Siemens SENTRON 3VA1120-5MH32-0AA0 molded case circuit breaker, 3-pole, 20 A rated, 187 kA breaking capacity at 240 V. Starter protection design with TM120M release. Current lifecy","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"76.2 mm","Height":"130 mm","Maximum":"0 A","Minimum":"0 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 500 V":"7.5 kA","at 690 V":"7.5 kA","at 40 °C":"20 A","at 45 °C":"20 A","at 50 °C":"20 A","at 55 °C":"20 A","at 60 °C":"19 A","at 65 °C":"19 A","at 70 °C":"19 A","Depth [In]":"2.76 in","Width [In]":"3 in","Height [In]":"5.12 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":"No","Design Of The Product":"Starter protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"12 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","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","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":"0","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":"https://cdn.aoctrl.com/b03a2d70b9e9b85e64af0d98d71d9ef7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=628671&mlfb=3VA1120-5MH32-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5MH32-0AA0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-5MH32-0AA0","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/3VA1120-5MH32-0AA0 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}}