What does TL mean on a fuse panel?

In a fuse panel, "TL" typically stands for "time-delay" or "time-lag" fuse. This type of fuse is designed to withstand temporary overloads without blowing immediately, allowing for brief surges in electrical current that might occur during the start-up of motors or other high-demand appliances. Time-delay fuses are useful in applications where inrush currents are expected, providing better protection for the circuit.