A fuse that contains a metal strip that melts instantly on a short circuit is known as what?

A fuse that contains a metal strip that melts instantly on a short circuit is known as what?

• A. Fast-acting fuse
• B. Slow-blow fuse
• C. Dual element fuse
• D. Thermal fuse

Answer: (C)

A fuse that melts essentially instantly when a short circuit occurs is a fast-acting fuse (fast-blow). Its metal strip is designed to melt immediately as soon as the current exceeds the rating, interrupting the circuit to protect wiring and components. Slow-blow fuses are built to tolerate brief surges, so they don’t blow instantly on a short. A dual-element fuse includes both a fast-acting and a time-delay element to handle both surges and faults, so its behavior isn’t simply “melts instantly” on a short. A thermal fuse opens when a specific temperature is reached, which is a temperature-triggered action rather than an instantaneous response to current. Therefore, the described behavior points to a fast-acting fuse.

A fuse that melts essentially instantly when a short circuit occurs is a fast-acting fuse (fast-blow). Its metal strip is designed to melt immediately as soon as the current exceeds the rating, interrupting the circuit to protect wiring and components. Slow-blow fuses are built to tolerate brief surges, so they don’t blow instantly on a short. A dual-element fuse includes both a fast-acting and a time-delay element to handle both surges and faults, so its behavior isn’t simply “melts instantly” on a short. A thermal fuse opens when a specific temperature is reached, which is a temperature-triggered action rather than an instantaneous response to current. Therefore, the described behavior points to a fast-acting fuse.