DC Series Motor Starting Resistor
Description:
Rotation in DC motors is produced by an applied voltage to the armature coils (in DC motors the rotating part is called the armature, in AC motors it is called the rotor). Resistors are used to limit the current flow to the motor to control torque and speed characteristics.
Nema Class 100: 30 seconds ON out of each 15 minutes.
Nema Class 110: 5 seconds ON out of each 80 seconds.
Nema Class 130: 10 seconds ON out of each 80 seconds.
Nema Class 140: 15 seconds ON out of each 90 seconds.
Nema Class 150: 15 seconds ON out of each 60 seconds.
Nema Class 160: 15 seconds ON out of each 45 seconds.
Nema Class 170: 15 seconds ON out of each 30 seconds.
Nema Class 90: Continuous Duty