A 4A slow-blow fuse is an electrical safety device with a current rating of 4 amperes. It is designed to protect electrical circuits and equipment from overcurrent conditions. Slow-blow fuses, also known as time-delay fuses, have a delayed response to overcurrent’s, allowing them to tolerate temporary current surges while still providing protection against sustained overloads.

These fuses are typically used in applications where precise and time-delayed protection is required. They are ideal for protecting sensitive electronic components, motors, and other equipment from short-term power surges while preventing damage to the circuit in case of prolonged overcurrent situations.

Slow-blow fuses are commonly used in both industrial and residential settings to ensure the safety and reliability of electrical systems.