The Cooper Bussmann 0.4A Fusetron Class RK5 Fuses FRS-R-4/10 are high-quality fuses designed for electrical equipment and industrial applications. Made by Bussmann, a trusted brand known for reliability and performance, these fuses come in a convenient box of 10. The FRS-R-4/10 model is specifically designed for a 0.4 amp rating, providing precise and efficient protection for your electrical systems. Ideal for businesses and industrial settings, these fuses ensure the safety and functionality of your electrical equipment.