Introducing the 3WT Air Circuit Breakers: A New Era of Power Distribution. In the dynamic landscape of electrical distribution, the 3WT Air Circuit Breakers emerge as a groundbreaking solution. Siemens’ electrical and mechanical components offer integrated technologies for the entire drive train, including couplings, gear units, motor stop control, and drive solutions for all engineering industries. One standout feature of the 3WT Air Circuit Breakers is their remarkable adaptability, encapsulated by only two frame sizes that seamlessly cover a broad spectrum of applications ranging from 400 A to 4000 A.