Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 322
Fig. 147. Modern Oil Circuit Breaker former may be used on either d. c. or a. c. circuits. They havecopper blades and fixed contacts with carbon secondary contactsarranged to open just after the heavy copper contacts. Thus thecurrent is carried by copper parts of ample size when the breaker… … C=S
Electrical engineering
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