Which type of safety device is commonly used for preventing electrical overload?

• A. Fuse
• B. Transformer
• C. Circuit breaker
• D. Surge protector

Answer: (C)

A circuit breaker is a safety device designed to protect an electrical circuit from damage caused by overload or a short circuit. When the current flowing through the circuit exceeds a predetermined level, the circuit breaker automatically interrupts the power supply, alleviating the risk of overheating or potential fire hazards. This feature of automatically resetting after being tripped provides convenience, as it can be easily reactivated once the issue causing the overload has been resolved.

While a fuse also serves the purpose of protecting circuits from overload, it operates differently; a fuse must be replaced after it has blown, which can be less convenient in some situations. A transformer, on the other hand, is used to change voltage levels in an electrical system and does not provide protection against overloads. Similarly, a surge protector is designed to protect devices from voltage spikes, but it does not specifically prevent overloads in the same manner as a circuit breaker. Hence, the choice of a circuit breaker is the most appropriate when discussing devices meant for preventing electrical overload.