Which of the following safety devices provides a weak link in a circuit that will melt if it received too much current, thus breaking the circuit and stopping the flow of electricity?

a. circuit breaker

b. fuse

c. gfci

d. insulation

I believe the correct answer from the choices listed above is option B. The safety device that provides a weak link in a circuit that will melt if it received too much current, thus breaking the circuit and stopping the flow of electricity would be a fuse. It interrupts an excessive current so that further damage by overheating or fire is prevented.