What two devices protect electrical circuits from overloads?

What two devices protect electrical circuits from overloads?

• A. Fuses and breakers
• B. Transformers and capacitors
• C. Switches and fuses
• D. Surge protectors only

Answer: (A)

When protecting circuits from overloads, you need devices that automatically disconnect the circuit if the current gets too high. Fuses do this by containing a thin metal link that melts and opens the circuit when the current exceeds its rating. Circuit breakers serve the same purpose but use a trip mechanism—thermal or magnetic—to open the circuit when there’s an overload or a short circuit; they can be reset after the fault is cleared. This combination provides reliable protection: fuses respond quickly and are single-use, while breakers can be reset and reused. Other options don’t fit as well. Transformers and capacitors handle voltage levels and energy storage, not automatic interruption of excessive current. Switches control power but don’t protect against overloads on their own. Surge protectors guard against voltage spikes, not sustained overloads.

When protecting circuits from overloads, you need devices that automatically disconnect the circuit if the current gets too high. Fuses do this by containing a thin metal link that melts and opens the circuit when the current exceeds its rating. Circuit breakers serve the same purpose but use a trip mechanism—thermal or magnetic—to open the circuit when there’s an overload or a short circuit; they can be reset after the fault is cleared. This combination provides reliable protection: fuses respond quickly and are single-use, while breakers can be reset and reused.

Other options don’t fit as well. Transformers and capacitors handle voltage levels and energy storage, not automatic interruption of excessive current. Switches control power but don’t protect against overloads on their own. Surge protectors guard against voltage spikes, not sustained overloads.