F4T6 is a part of Bel Fuse that is used as a miniature fast-acting fuse. It is designed to withstand high inrush current surges, reducing the need for extra components such as resistors, circuits and thermal bulbs. The F4T6 is made from a glass tube with a metal end cap and an arc shield surrounding the internal fuse element. The F4T6 is UL recognized, making it a safe choice for a variety of applications, ranging from consumer electronics to industrial equipment.