Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 132
CURRENT AND PRESSURE LIMITING DEVICES l.fiol for the protection of motors in the event of a temporary weakeningor failure of the pressure. They are also used in connection witha low voltage release or shunt trip coil on an oil switch or acircuit breaker. Reverse Energy Relays.—The chief object of… … Fig. 2.305.—General Electric direct current solenoid control relay. Solenoids for operatinglarge switches, etc., frequently require comparatively large operating currents in theclosing coils. This necessitates the use of relatively heavy leads between the controlswitch and the solenoid and is the…
Electrical engineering
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