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 180
Fig. 61. Group of Sprague-General Electric Unit Switch circuit. When the solenoid is energized the contact piece is pulledinto firm contact with a stationary finger which forms the otherterminal of the circuit and the main circuit is thus closed. When nocurrent flows in the coil a spring restores… … ELECTRIC RAILWAYS 59 AUXILIARY■ CONTACTS CONTACT DI6C position, thus opening the main switch. The circuit-breaking con-tacts are enclosed in a chamber of fire-resisting material of the formshown, thus confining the burning action of the arc to the renewablecontact fingers. The arc is extinguished…
Electrical engineering
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