Siemens expands 3WA circuit breaker series


Siemens has launched two new additional versions of its Sentron 3WA Power Circuit Breakers, alternatively known as Air Circuit Breakers (ACBs).

Series 3WA3 meets the requirements of UL 1066 and IEC 60947-2 standards, which enables customers to use it worldwide. This is particularly advantageous for switchgear manufacturers and OEMs producing systems for both standardisation areas – IEC and UL. The 3WA2 series is designed exclusively for the UL 489 market. The two new ACB model series complement the 3WA1 version for IEC markets, launched in the autumn of 2020.

Siemens offers a full range of ACBs which are based on a consistent system and offer great flexibility for applications around the globe. The Sentron 3WA Power Circuit Breakers are part of the Siemens Xcelerator portfolio. 
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 also essential for critical infrastructure, such as hospitals or data centres. The new circuit breaker follows the company’s tradition of high reliability ACBs that are built to perform over the lifetime of a facility. At the same time, it supports software-based planning and engineering, digital testing and monitoring, and seamless integration in automation and IoT systems. Upgrades can be completed 100% digitally. Users simply have to download new features and add them using an app. 
When technological requirements change, it is easy to add new features to the electronic trip unit (ETU600) installed in the Sentron 3WA air circuit breakers using the Sentron ‘powerconfig’ commissioning software and a USB/communication port. For applications without a need for measuring functions or scaling options, they can also be configured with an ETU300 for easy standard protection.  
The new 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 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 800-5,000A.

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