Slow-blow fuses, also known as time-delay fuses or time-lag fuses, are a type of electrical protection device designed to withstand temporary overcurrent conditions without immediately blowing or opening the circuit. They are different from fast-acting (fast-blow) fuses, which will quickly open the circuit in response to any overcurrent.
Slow-blow fuses are typically identified by a special marking or colour code to distinguish them from fast-blow fuses. It's crucial to use the correct type of fuse for your specific application to ensure safety and proper circuit protection.
These fuses are commonly used in applications where momentary overcurrent’s are expected but should not cause nuisance tripping or unnecessary interruptions. Some examples of applications that may use slow-blow fuses include electric motors, transformers, power supplies, and electronic devices with capacitors that require time to charge during startup.