Circuit breakers for next generation electrical distribution
Siemens has launched two versions of its Air Circuit Breakers (ACBs) for the next generation of electrical distribution networks with digital control.
The Sentron 3WA Power Circuit Breakers meet the requirements of UL 1066 and IEC 60947-2 standards to improve ease of use, reliability, and digitalization when integrating into existing systems worldwide. This is key for switchgear manufacturers and OEMs producing systems for both the IEC and UL standardization areas.
As a core element of low-voltage switchboards, ACBs reliably protect electrical installations in buildings, infrastructure and industrial facilities from damage caused by short circuits, ground faults or overload faults. This is essential also for critical infrastructure, such as hospitals or data centres.
The Sentron 3WA circuit breakers support software-based planning and engineering, digital testing and monitoring, and seamless integration in automation and IoT systems. Upgrades can be completed 100 percent digitally. Users simply download new features from the Internet and add them using an app.
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The 3WA2 series is designed exclusively for the UL 489 market. The two new ACB model series complement the 3WA1 version for IEC markets, which has been launched in the fall of 2020.
The Sentron 3WA Power Circuit Breakers are part of the Siemens Xcelerator portfolio as an open digital business platform that enables customers to accelerate their digital transformation easier, faster, and at scale.
“Our highly flexible ACB series perfectly addresses the needs of switchgear manufacturers and panel builders in an environment characterized by increasing complexity, digitalization, and cost pressures,” said Andreas Matthé, CEO of Electrical Products at Siemens Smart Infrastructure.
New features can be added to the electronic trip unit (ETU600) installed in the Sentron 3WA air circuit breakers using the Sentron “powerconfig” commissioning software and a USB or communication port. The features are available online and are continually expanded by Siemens. Users benefit from high investment protection. For applications without a need for measuring functions or scaling options, the Sentron 3WA ACBs can now also be configured with an ETU300 for easy standard protection.
The Sentron 3WA ACB trip units also have more standard features, such as the integrated arc energy reduction feature (Dynamic Arc Flash Sentry, DAS+), which ensures that Sentron 3WA ACBs 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 complies 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 Sentron 3WA ACB UL series 3WA2 and 3WA3 are available in three frame sizes with rated current ranges from 800 to 5,000 A.
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