A dual-element fuse has which components?

A dual-element fuse has which components?

• A. a thermal cutout and a normal fuse link
• B. a thermal fuse and a resistor
• C. a magnetic switch and a fuse link
• D. a surge suppressor

Answer: (A)

A dual-element fuse is designed to protect equipment from both overcurrent and overheating. It combines a fuse link that normally carries current and melts to interrupt the circuit when overload occurs, with a thermal cutout that opens if the temperature gets too high, providing protection even if the fuse hasn’t blown yet. Other options don’t fit because a resistor isn’t part of a fuse assembly, a magnetic switch corresponds to a circuit breaker mechanism, and a surge suppressor protects against voltage spikes rather than providing the dual protection of current and temperature. So the two components are a thermal cutout and a normal fuse link.

A dual-element fuse is designed to protect equipment from both overcurrent and overheating. It combines a fuse link that normally carries current and melts to interrupt the circuit when overload occurs, with a thermal cutout that opens if the temperature gets too high, providing protection even if the fuse hasn’t blown yet. Other options don’t fit because a resistor isn’t part of a fuse assembly, a magnetic switch corresponds to a circuit breaker mechanism, and a surge suppressor protects against voltage spikes rather than providing the dual protection of current and temperature. So the two components are a thermal cutout and a normal fuse link.