Sentron 3WA Power Circuit Breakers

Siemens has launched two 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 it to be used 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, which launched in autumn 2020. Siemens offers a full range of ACBs which are based on a consistent system and offer flexibility for applications around the globe.

A core element of low-voltage switchboards, ACBs 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. While built to perform over the lifetime of a facility, the Sentron 3WA circuit breakers also support software-based planning and engineering, digital testing and monitoring, and seamless integration in automation and IoT systems. Upgrades can be completed 100% digitally.

The Sentron 3WA ACB trip units’ features include integrated arc energy reduction (Dynamic Arc Flash Sentry, DAS+), enabling Sentron 3WA ACBs to trip 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 5000 A.