Which device is used to protect electrical circuits from overloads?

The use of a circuit breaker to protect electrical circuits from overloads is well-founded in its design and function. Circuit breakers are specifically engineered to interrupt the flow of current when it detects an overload condition, which can occur when too much current flows due to excessive load. By automatically shutting off the circuit, they prevent potential damage to wiring and equipment and reduce the risk of fire.

In addition, circuit breakers are reusable; once an overload condition is identified and resolved, they can be reset without needing to replace any physical components, unlike certain other protective devices. This makes them not only effective for safety but also convenient for ongoing electrical maintenance.

While fuses also provide protection against overloads, they do so in a way that is consumable; they need to be replaced after blowing. Transformers, on the other hand, are designed for voltage conversion and do not provide overload protection, and resistors are used to limit current flow in circuits, not to interrupt in the event of an overload. This solidifies the circuit breaker as the ideal option for protecting circuits from overloads.