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Overcurrent protection is essential in electrical systems to prevent damage caused by excessive current flow. Circuit breakers and fuses serve as protective devices designed specifically for this purpose.

Circuit breakers are electromechanical devices that interrupt the flow of electricity when they detect an overcurrent, effectively protecting the wiring and connected devices from potential overheating and damage. They can be reset after tripping, making them a reusable option for protection.

Fuses, on the other hand, are sacrificial devices that contain a thin wire designed to melt and break the circuit when the current exceeds a specified limit. This ensures that the current does not reach hazardous levels that could result in overheating or fire.

In contrast, power transformers and capacitors do not provide overcurrent protection; their primary functions are to adjust voltage levels and store electrical energy, respectively. Switches control the flow of electricity but do not offer protection against overcurrent on their own.

Thus, circuit breakers or fuses are the correct devices for overcurrent protection within electrical systems.