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SYMBOLS AND DIAGRAMS
ALTERNATINGCURRENT CONTACTORS AND RELAYS
6 other sections not shown
a-c contactors a-c motors adjusted amperes applications arc chute armature assembly brake cable capacitor cast grids circuit breakers closed coil coil current connection diagram contact structure contactor ratings contactors and relays continuous current rating control center control circuits control devices control equipment control panel control voltage control-circuit devices copper current flows current-carrying capacity curve drive duty cycle Electrical electrodes electrolite enclosed enclosure energized heat horsepower horsepower ratings inch inrush current installation insulating interrupting joint limit switches line contactor load low-voltage machine magnetic control manufacturer master switch material metal motor control mounted National Electrical Code obtained operating overload operation overload oxide phototube plunger pole pushbutton rated voltage rectifier relay coil resistance resistor rheostat secondary selected Selenium sensing head shaft shown in Fig solenoid speed standard starters symbols Table tactor temperature rise terminal boards Thrustor mechanism thyratron tion torque tube typical unit volts wiring wound-rotor motors