What is the general purpose of overcurrent devices?

• A. To protect circuits and equipment against fault conditions
• B. To regulate power factor
• C. To monitor earth resistance
• D. To provide line isolation

Answer: (A)

Overcurrent protection is about preventing damage by interrupting excessive current. Overcurrent devices like fuses and circuit breakers are designed to sense when current exceeds their rating and open the circuit. This stops overheating of conductors and insulation, reduces the risk of fire, and protects connected equipment during fault conditions such as overloads and short circuits. They aren’t intended to regulate power factor, monitor earth resistance, or primarily provide line isolation. The primary purpose is to protect circuits and equipment against fault conditions.