“Magne-Blast” air circuit breaker for 5,000-volt service

Fundamental principles of magnetic action and thermal reaction have been united in an original manner to create a new circuit interrupter, the “Magne-Blast” air circuit breaker. Intended for general applications in switching, controlling, and protecting 2,300- to 5,000-volt circuits, this breaker, throughout a comprehensive test program, has proved satisfactory in every requirement. An open presentation of test results shows how an efficient arc chute functions thermally to decay and extinguish the arc with a minimum of voltage disturbance. The breaker is immune to circuit recovery characteristics.