{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0BH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0BH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0BH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0BH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON molded case circuit breaker, 3VA1120-4EF32-0BH0, 20 A, 3-pole, 121 kA interrupting at 240 V, with undervoltage release and auxiliary switches.","salesMarkdown":"At 415 V it still holds 75.6 kA, and at 690 V it's 11.9 kA, so it covers low-voltage distribution up through 690 V line-to-line. Rated continuous current is 20 A across the ambient range from 40 °C to 55 °C; above that it derates to 19 A at 60–70 °C. That's enough for remote status monitoring and a safety undervoltage trip without adding external relays. The UVR is what makes this a fit for emergency-stop chains or generator-transfer schemes where loss of control voltage must drop the load. ## Sizing and selectivity reality For a 20 A MCCB in a typical distribution board, it's manageable, but it's not a number to ignore in a sealed stainless-steel cabinet. Compared to the 3VA1110-5ED36-0AC0, which is a 16 A frame with different trip characteristics, this 20 A unit keeps the same 3-pole footprint and the same SENTRON platform. If you're replacing a 16 A MCCB in an existing panel, the 20 A version will bolt into the same bus bars and mounting holes — no rewiring needed — provided the upstream protection and cable sizing allow the higher rating. The auxiliary switch count and UVR fit are identical, so the control wiring carries over unchanged. ## Panel fit and environmental range Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that drops into SENTRON distribution boards and most third-party panelboards with bus-bar centers at 60 mm. No derating for altitude is listed, but the 800 V insulation rating gives headroom for high-altitude installations.","metaTitle":"Siemens 3VA1120-4EF32-0BH0 SENTRON MCCB, 20 A, 3-Pole, 121 k","metaDescription":"Siemens 3VA1120-4EF32-0BH0 SENTRON molded case circuit breaker, 20 A rated, 3-pole, 121 kA at 240 V, undervoltage release, active production. Quoted to order.","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":"Yes","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 + 1 trip alarm switch 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":"3VA9608-0BB11","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":"3","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","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=180554&mlfb=3VA1120-4EF32-0BH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0BH0/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3VA1120-4EF32-0BH0 and how is it quoted?","answer":"This part is sourced through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time against an RFQ. Volume inquiries are welcome."},{"question":"Will 3VA1120-4EF32-0BH0 drop into a panel that was specified around 3VA1110-5ED36-0AC0 without rewiring?","answer":"Yes — same 3-pole SENTRON footprint (70 mm deep, 76.2 mm wide, 130 mm tall), same bus-bar centers, same auxiliary switch and UVR wiring. The only change is the higher 20 A rating, so verify upstream protection and cable ampacity before swapping."},{"question":"What is the interrupting capacity at 240 V?","answer":"121 kA at 240 V. At 415 V it is 75.6 kA, at 440 V it is 52.5 kA, and at 690 V it is 11.9 kA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0BH0","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/3VA1120-4EF32-0BH0 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}}