The Littelfuse F09B SB .4A is a 0.4A fuse designed for reliable circuit protection in low-current applications. This fuse is ideal for safeguarding sensitive electronic devices, ensuring they function safely and efficiently. With a compact design, it fits easily into various applications, including automotive and consumer electronics. The F09B SB .4A meets industry safety standards, providing peace of mind for users. Constructed from high-quality materials, this fuse offers durability and longevity, making it a preferred choice for professionals in the field.