A time limit fuse, also commonly known as a time-delay fuse, is designed to provide reliable circuit protection while allowing temporary current surges without unnecessary interruption. Unlike fast-acting fuses, time limit fuses can withstand short-duration overloads that occur during equipment start-up, such as in motors, transformers, and inductive loads. This makes them ideal for applications where inrush currents are normal.

The key feature of a time limit fuse is its controlled delay before opening the circuit when an overcurrent condition occurs. This delay helps prevent nuisance tripping while still ensuring protection against sustained overloads and short circuits. Time limit fuses are widely used in industrial, commercial, and HVAC systems where operational continuity is important.