Bussmann 4 amp fast acting glass fuses are designed to provide reliable overcurrent protection for electronic and automotive circuits. Featuring a 1-1/4 inch glass tube with nickel-plated brass end caps, these fuses ensure consistent performance and durability. The fast-acting design helps quickly interrupt excess current, protecting sensitive equipment from damage. UL and CSA listed for safety compliance, this 5-pack is ideal for maintenance, repair, and replacement applications in household and electrical systems.