37215000431 Fuse, PCB Leaded, 5 A, 250 VAC, 372 Series, Time Delay, Radial. The 372 series from Littlefuse are TR5, sub miniature time lag radial leaded fuses. The fuses can be either soldered directly into a printed circuit board or can be plugged into a two pin socket. The 370 series fuses are designed in accordance to IEC 60127-3 standards.