Final answer:
A Class T fuse is known for its fast opening of a circuit under overload. It has a long body compared to other fuse types.
Step-by-step explanation:
A Class T fuse is identified by its fast opening of a circuit under overload. When excessive current flows through the fuse, the metal strip with a low melting point heats up and breaks the electrical connection. This protects the rest of the circuit from damage. Unlike other fuse types, a Class T fuse has a long body length compared to other fuse types.