Fast Blow Fuse Time

In this article we will discuss fast blow fuse vs time delay fuse.

Fast blow fuse time.

A slow blow fuse is normally used in the motor industry because when you start an engine at that moment a high current of electricity is passed through the electronic circuit. A slow blow fuse requires higher i2t than fast blow fuses to blow up. Many people think that time delay fuses are less effective because they allow current overloads pass through the circuits. These types of fuse are used on equipment such as motors which can draw larger than.

In general the time required for a fuse to blow can be given i2t where i is the current and t is the time. Slow blow fuse requires much higher time than the fast acting one. Hence the fuses could be blown. Examples if a circuit has a current rating of 15 amperes and a voltage rating of 120 volts then the current rating should not exceed 15 amperes and the voltage rating should be at least 120 volts.

A time delay fuse also known as an anti surge or slow blow fuse is designed to allow a current which is above the rated value of the fuse to flow for a short period of time without the fuse blowing. But not all surges are the same and not all time delay fuses are the same. For example if you send 40 amp current through a 30 amp fast blow fuse it will blow almost immediately. Fast acting fuses should be used in motor circuits will blow more frequently.

It would seem obvious that a fast blow fuse would be appropriate for a load without a startup surge and a slow blow or time delay fuse for the one with the surge. The uses for a slow blow fuse and a fast blow fuse.