Dynamos and motors; a text book for colleges and technical schools (1911)
Franklin, William S. (William Suddards), 1863-1930, Esty, William, 1868-1928 · New York The Macmillan company · leaf 420
k. It is neces-sary therefore to thoroughly pro-tect the metal contacts of the circuitbreaker from the destructive actionof this arc by having a pair of aux-iliary contacts in parallel with themain contacts and so arranged thatthe main contacts open first with-out an arc) and the auxiliary… … Type B, Oil Circuit Breaker, Switchboard Mounting (Front View). Fig. 299. 412 DYNAMOS AND MOTORS. Circuit breakers for high voltage alternating-current circuitsare usually arranged to open the circuit under oil. Thus, Figs.299 and 300 show the front and rear views of an automatic oilswitch (circuit…
Dynamos · Electric motors
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