Final answer:
Fuses and circuit breakers are devices designed to break the flow of current in the event of an overload, with fuses having a one-time use and circuit breakers being resettable.
Step-by-step explanation:
The devices that break the flow of current when an overload occurs are fuses and circuit breakers. A fuse contains a metal strip with a low melting point, which melts when the current exceeds a threshold, thereby permanently breaking the circuit. On the other hand, a circuit breaker has a mechanism, often a bimetallic strip, that triggers a switch to open the circuit in response to excessive current, but it can be reset after tripping. Both are crucial for preventing thermal hazards by interrupting excessive currents in electrical circuits.
The device that breaks the flow of current when an overload occurs is the circuit breaker.
A circuit breaker is an automatic but restorable electric switch that interrupts excessive currents to prevent thermal hazards. It contains a bimetallic strip that bends and breaks the electrical connection at the points if overheated. Unlike a fuse, a circuit breaker can be reset after it trips.
Examples include the circuit breakers found in household electrical panels and power distribution systems.