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Motor protection safeguards the motor, the supply system and personnel from various operating conditions of the driven load, the supply system or the motor itself. |
C Motor protection categories include |
S Overcurrent Protection |
S Overload Protection |
S Other Types of Protection. |
• The National Electrical Code requires that |
motors and their conductors be protected from both overcurrent and overload conditions. |
Overcurrent Protection |
Overcurrent protection interrupts the electrical circuit to the motor upon excessive current demand on the supply system from either short circuits or ground faults. |
• Overcurrent protection is required to protect personnel, the motor branch circuit conductors, |
control equipment, and motor from these high currents. |
• Overcurrent protection is usually provided in the form of fuses or circuit breakers. These |
devices operate when a short circuit, ground fault or an extremely heavy overload occurs. |
S Most overcurrent sources produce extremely large currents very quickly. |