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alternating current amount ampere-turns amperes applied armature auxiliary contact battery blow-out coil Chapter circuit breaker circuit shown coil circuit coil is energized coil of relay combination condenser connected in series contact closes contactor contacts open control circuit current flow cycle deenergized delay desired device direct current Dynamic Braking employed flux frequency heat impulse indicated inductance inrush insulation interrupt Item lamp latch limit line voltage load contacts lock-up low voltage magnetic relay magnetic structure mechanical midget motor moving contact necessary normal position normally-closed contact normally-open contact ohms overload permit pilot contact pilot instrument poles potentiometer power supply push button reactance reclose rectifier relay coil relay contact relay Rl Relay Type resistance resistor result reverse rotate sensitive relay short circuited shown in Fig shunt single-break solenoid spring Struthers-Dunn switch Table temperature terminals thermal relay timer torque transfer tube unit usually vacuum tube volts