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 224
d on a porcelain insulator, and theplunger, instead of acting directly on thecontacts, operates a small switch throughan insulating rod. Underload. Underload relays aresimilar to overload relays, except thatthey are designed so that the normalcurrent holds the plunger up, and whenthe current falls… … Fig. 65. Alternating-Current Time Limit Overload Relay Courtesy of Westinghouse Electric and Manufacturing Company
Electrical engineering
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