Air breakers for power-house drives

A COMPACT GROUP of seven Westinghouse De-ion air circuit breakers, with interrupting rating of 13,850 amperes, controls the 3-phase 60-cycle 4,150-volt circuits for auxiliary drives serving a 200,000-pound-per-hour boiler and the 20,000-kw turbine at the Blount Street station of the Madison (Wis.) Gas and Electric Company. Based upon ten months´ service, the maximum number of operations of any one breaker has been about 553 and the number of average automatic openings of all breakers 341.