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Siemens launches new 3VA UL large frame molded case circuit breakers 

3VA molded case circuit breakers UL Large Frame 1,200 A, 1,600 A and 2,000 A - family picture

The primary responsibility of MCCBs is to protect personnel and equipment against electrical damage and failures. The integrated arc energy reduction feature (Dynamic Arc Flash Sentry, DAS+) ensures that new 3VA UL Large Frame MCCBs trip more rapidly in the event of a fault during work being carried out in the immediate vicinity of live parts. In this way, the arc energy and thus the energy released in the power distribution equipment room is reduced. This technology is in compliance with the National Electric Code (NEC) for the US market; it is designed to protect service technicians from serious injury resulting from arc flash hazards.
The 3VA UL Large Frame electronic trip unit versions offer fully integrated communication and measurement features. Energy and circuit breaker data is recorded with an accuracy of +/-1% and transmitted to higher-level systems. This functionality is integrated into the electronic trip unit (ETU) and no longer requires additional accessories to be mounted in the circuit breaker. In addition, all 3VA MCCB frame sizes (125 - 2,000 A) use common internal accessories. This allows for flexible functional adjustments, lowers inventory levels, simplifies planning and selection, and reduces overall time and costs. 

Feature highlights:

  • Common internal accessories with the existing 3VA MCCB portfolio (alarm switches, auxiliary switches, shunt trips, undervoltage releases, etc.).
  • Extensive suite of external accessories including connection technology, mounting bases, external circuit breaker operators, interlocks, and test devices.
  • UL 100% ratings available in 1.200 A and 1.600 A frame sizes – available for thermal-magnetic trip unit (TMTU) and electronic trip unit (ETU) circuit breakers.
  • DAS+ Arc Energy Reduction as a standard feature in all ETU versions – US National Electric Code compliant.
  • Circuit breakers equipped with ETU and LCD display are communication-ready; additional communication modules are not required. 
  • The mechanical platform is based on the predecessor 3VL design with 25 years of installed base and proven best-in-class reliability. As a result, the footprint is nearly identical to 3VL7 (NG) and 3VL8 (PG) MCCBs, allowing for a simple upgrade to 3VA molded case circuit breakers in existing switchgears.
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Siemens Smart Infrastructure (SI) is shaping the market for intelligent, adaptive infrastructure for today and the future. It addresses the pressing challenges of urbanization and climate change by connecting energy systems, buildings and industries. SI provides customers with a comprehensive end-to-end portfolio from a single source – with products, systems, solutions and services from the point of power generation all the way to consumption. With an increasingly digitalized ecosystem, it helps customers thrive and communities progress while contributing toward protecting the planet. Siemens Smart Infrastructure has its global headquarters in Zug, Switzerland. As of September 30, 2021, the business had around 70,400 employees worldwide
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Siemens AG (Berlin and Munich) is a technology company focused on industry, infrastructure, transport, and healthcare. From more resource-efficient factories, resilient supply chains, and smarter buildings and grids, to cleaner and more comfortable transportation as well as advanced healthcare, the company creates technology with purpose adding real value for customers. By combining the real and the digital worlds, Siemens empowers its customers to transform their industries and markets, helping them to transform the everyday for billions of people. Siemens also owns a majority stake in the publicly listed company Siemens Healthineers, a globally leading medical technology provider shaping the future of healthcare. In addition, Siemens holds a minority stake in Siemens Energy, a global leader in the transmission and generation of electrical power.
In fiscal 2021, which ended on September 30, 2021, the Siemens Group generated revenue of €62.3 billion and net income of €6.7 billion. As of September 30, 2021, the company had around 303,000 employees worldwide. Further information is available on the Internet at
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Christian S. Wilson

Siemens AG

+49 172 1385608