37003150430 Fuse, PCB Leaded, 315 mA, 250 VAC, TR5 Series, Fast Acting. The 370 series from Littlefuse are TR5, sub miniature, fast acting radial leaded fuses. These fuses 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.