Which device is more commonly used in circuits, fuses or circuit breakers, and why?

The choice of circuit breakers as the more commonly used device in circuits is well-founded primarily because they offer the significant advantage of being resettable. Unlike fuses, which must be replaced after they blow, circuit breakers can be turned back on after a fault is cleared. This reset feature not only adds convenience but also reduces downtime in electrical systems, leading to more efficient operation, especially in complex or critical applications where power needs to be restored quickly.

Moreover, circuit breakers are designed to handle multiple trips, which can occur during transient faults, allowing for a more resilient and adaptive circuit. Their ability to handle overcurrent situations without the need for replacement makes them a preferred choice for both residential and commercial electrical systems.

While cost and size considerations are important, the operational flexibility and reliability of circuit breakers generally outweigh those factors, making them the dominant choice in modern circuit protection.