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Circuit Breaker 64 Now in production is new single-pole circuit breaker for 240v. a.c. and 125v. d.c., 50 amp. max. It may be front or rear connected and has instantaneous trip or selection of three time delays. Measuring 5%-in. long by 2 11/16-in. high, and 1%-in. wide, breaker is made by Heinemann Circuit Breaker Co., Trenton, N. J.—AVIATION, Nov., ’44.