A time-delay slow-blow fuse, also known as a time-lag fuse, is an electrical safety device designed to provide delayed protection against overcurrent conditions. These fuses are characterised by their ability to tolerate temporary current surges without blowing immediately, making them suitable for applications where short-term power spikes are common. They offer a balance between protecting circuits and equipment while allowing for the brief, high-current demands of certain devices.
Time-delay slow-blow fuses are available in various types and sizes, typically categorised by their physical dimensions, and current ratings which are expressed in amperes (A). Examples of common current ratings include 1A, 5A, 10A, 20A and 30A.
These fuses are used in various industries, including automotive, industrial, electronics, and residential applications. They protect sensitive electronics, motors, appliances, and electrical circuits from damage due to overcurrent conditions. When selecting a time-delay slow-blow fuse, it's essential to consider the voltage rating, current rating, and time-delay characteristic to ensure precise protection for the application.