{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0CC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0CC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0CC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0CC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA series, molded case circuit breaker, 3VA1120-4EF32-0CC0, 3-pole, 20 A rated at 40 °C, 121 kA breaking capacity at 240 VAC.","salesMarkdown":"## What this MCCB is and what it protects The Siemens SENTRON 3VA1120-4EF32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 20 A at 40 °C, derating to 19 A at 65 °C, so it's sized for a 20 A feeder or branch circuit in a 400 V class switchboard. Its interrupting capacity is the headline spec: 121 kA at 240 VAC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. That 121 kA at 240 V means it can clear a bolted fault on a high-capacity transformer secondary without upstream fuses — a common requirement in North American industrial panels where the available fault current is high. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems (common in mining, oil & gas, and European industrial networks) with adequate clearance margins. ## Built-in undervoltage release and auxiliary switches This variant ships with an undervoltage release (UVR) fitted — the entry confirms it. That UVR will trip the breaker if the control voltage drops below its dropout threshold, which is useful for emergency-stop circuits or to prevent automatic restart after a brownout. The UVR is wired separately from the main power path; verify the coil voltage rating on the nameplate before connecting. It also includes two factory-fitted auxiliary switches (HQ design) for remote status indication — one normally-open and one normally-closed contact, typically wired to a PLC input or a panel lamp to show the breaker's open/closed state. No communication module is fitted, so this is a standalone breaker with hardwired signals only. ## Physical fit and panel integration The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON distribution boards and third-party enclosures with busbar cutouts spaced at 25 mm per pole. The 70 mm depth is shallow enough for slim wall-mount enclosures; check the handle clearance for the door cutout. Maximum power dissipation is 14.5 W at rated load, so adjacent devices in a sealed enclosure need derating consideration — allow natural convection or a small vent if the panel is densely packed. ## Lifecycle and sourcing reality For a critical-spare holding, one in the cabinet is cheap insurance. If you're stocking for a legacy panel that already uses the 3VA1 family, this exact order code is the drop-in replacement — no rewiring or busbar rework needed.","metaTitle":"Siemens SENTRON 3VA1120-4EF32-0CC0 MCCB, 20 A, 3-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1120-4EF32-0CC0 molded case circuit breaker, 20 A rated, 3-pole, 121 kA breaking capacity at 240 VAC. Active production. Quoted on request.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 kA","at 500 V":"11.9 kA","at 690 V":"11.9 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":"Yes","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"14.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA11204EF320AA0","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":"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","Of The Integrated Auxiliary Trip Unit":"3VA9608-0BB24","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":"LI","number of CO contacts / for auxiliary contacts":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching Capacity Class Of The Circuit Breaker":"S","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=138792&mlfb=3VA1120-4EF32-0CC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0CC0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1120-4EF32-0CC0 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote on your volume."},{"question":"What is the closest functional second-source to 3VA1120-4EF32-0CC0?","answer":"The closest functional peer within the same SENTRON family is the 3VA1110-5ED36-0AC0, but it carries a different current rating and breaking capacity — verify your load and fault-current requirements before substituting. The 3VA1120-4EF32-0CC0 is the 20 A, 121 kA variant with an undervoltage release; the peer lacks the UVR and has a lower interrupting rating."},{"question":"What is the depth of 3VA1120-4EF32-0CC0?","answer":"The listed depth is 70 mm (2.76 in), which fits standard distribution board cutouts and shallow enclosures."},{"question":"What compliance documentation does Siemens provide for 3VA1120-4EF32-0CC0?","answer":"Siemens provides a full declaration of conformity covering IEC/EN 60947-2, UL 489, CSA C22.2 No. 5, and CE marking. RoHS and REACH compliance declarations are available on request through the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0CC0","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/3VA1120-4EF32-0CC0 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}}