Transformer and Fluorescent Lighting Circuit:

To cater for inrush currents, the fuse link to be provided should have a rating approximately twice the transformer primary current: or the total current required by the maximum number of fluorescent lights to be switched simultaneously.

Capacitor Circuits:

Three-phase power factor correction capacitors also have transient high-inrush characteristics. In addition, fuse protection needs to take into account circuit harmonics. Practical experience has shown that a fuse link rated at 50% higher than the rated capacitor current provides a satisfactory solution.