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SYMBOLS AND DIAGRAMS
ALTERNATINGCURRENT CONTACTORS AND RELAYS
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a-c contactors a-c motors actuating contact adjusted amperes applications arc chute armature assembly brake cable capacitor cast grids circuit breakers closed coil coil current connection diagram contact structure contactor ratings continuous current rating control center control circuits control devices control equipment control panel control switch control voltage control-circuit devices copper current-carrying capacity drive duty cycle Electrical electrodes electrolite enclosed enclosure energized ﬁlm ﬂow ﬂux heat horsepower horsepower ratings inch inrush current installation insulating interrupting limit switches line contactor load low-voltage machine magnetic control manufacturer master switch material motor control mounted National Electrical Code normal obtained operating overload operation overload oxide phototube plunger pole pushbutton rated voltage rectiﬁer rectifiers resistance resistor rheostat secondary Selenium sensing head shaft shown in Fig solenoid speciﬁc speed standard starters symbols Table tactor temperature rise terminal boards Thrustor mechanism thyratron tion torque transformer tube typical unit volts wiring wound-rotor motors