Which protective device is typically used in high current circuits and functions similarly to a fuse?

• A. Fuse
• B. Current Limiter
• C. Circuit Breaker
• D. Resistor

Answer: (B)

In high-current circuits, the protection goal is to keep current from exceeding what the system can safely handle. A device that acts like a fuse does this by preventing damage during an overcurrent, and a current limiter achieves that by enforcing a maximum current and keeping the flow at that level. It responds to rising current by capping it, so the circuit avoids stressing cables, components, and insulation. This active control mirrors the protective intent of a fuse in situations where you need to prevent damage without fully interrupting the circuit, which is especially important in high-current environments. A resistor doesn’t provide overcurrent protection, and while fuses and circuit breakers interrupt faults, the current limiter is the one described as maintaining safe current levels in real time.