{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VM1120-5MH32-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VM1120-5MH32-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VM1120-5MH32-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VM1120-5MH32-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON molded case circuit breaker, 3VM1120-5MH32-0AA0, 3-pole, 320 A maximum, TM120M thermal-magnetic release, IP40 front protection.","salesMarkdown":"Three poles, rated for a maximum of 320 A, with a TM120M thermal-magnetic overcurrent release. ## Breaking capacity — what it interrupts and where Rated breaking capacity varies sharply with system voltage. At 240 V it clears 187 kA — enough for most low-voltage industrial services. That last number matters: on a 480/500 V system (common in North American and some Asian plants), the available fault current has to be coordinated with this 17 kA ceiling, or the breaker won't interrupt a high-energy fault safely. Insulation voltage is rated at 800 V, so the internal clearances are there for 690 V class systems — the limitation is the arc extinction at higher voltages, not the dielectric. ## Thermal derating — continuous current vs panel temperature Continuous current rating holds at 20 A from 40 °C through 55 °C ambient. At 60 °C it drops to 19 A, and it stays at 19 A through 70 °C. ## What it doesn't have — and why that matters for your panel This is a bare electromechanical MCCB — if you need remote signaling or a shunt trip for emergency-off circuits, you'll add external accessories or pick a different variant. The 3-pole form factor fits standard SENTRON panel-mounting footprints; dimensions are 70 mm deep, 76.2 mm wide, 130 mm high. Width is exactly 3 inches — matches the standard MCCB cell width in most distribution boards.","metaTitle":"Siemens 3VM1120-5MH32-0AA0 SENTRON MCCB, 320 A, 3-Pole","metaDescription":"Siemens 3VM1120-5MH32-0AA0 SENTRON molded case circuit breaker. 320 A max, 3-pole, TM120M release. Rated 187 kA at 240 V, 121 kA at 415 V. IP40 front. Current production. Sourced t","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":"320 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"75 kA","at 500 V":"17 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":"Startetptotection","Communication Function":"No","Phase Failure Detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"2 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 capacity values in DC power systems, see the 3VA Molded Case Circuit Breaker Manual; link available 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","operating voltage / at DC / rated value":"500 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":"15 000","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front connection"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/890a9c4e8f724baae13c5de28442f149.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=628687&mlfb=3VM1120-5MH32-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VM1120-5MH32-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VM1120-5MH32-0AA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers on the public page."},{"question":"What's the breaking capacity of 3VM1120-5MH32-0AA0 at 415 V?","answer":"Rated breaking capacity at 415 V is 121 kA. At 240 V it's 187 kA; at 440 V it's 75 kA; at 500 V it's 17 kA. The 500 V figure is the coordination limit for 480 V class systems."},{"question":"Does 3VM1120-5MH32-0AA0 have ground-fault protection?","answer":"No. The ground-fault monitoring version is listed as 'Without', and the product function for grounding protection is also 'No'. This is a straight thermal-magnetic breaker with no GFCI or ground-fault relay built in."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VM1120-5MH32-0AA0","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/3VM1120-5MH32-0AA0 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}}