Fast Blow Fuse Vs Slow Blow Fuse

The accumulated heat from adjacent sections helps blow the fuse.

Fast blow fuse vs slow blow fuse.

Hence the fuses could be blown. It has a higher i2t value which means that it takes more energy to blow out than its fast acting counterpart with the same rating. 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 slow blow fuse though is constructed different internally.

Sometimes it is visually less apparent. Read the manufacturer s label if it says fast or slow the fuse type is as it is labeled. 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. Slow blow fuse that can withstand a heavy current up to ten times its rated value for a small period of time before it opens.

Here the coiled structure is clear. For example if you send 40 amp current through a 30 amp fast blow fuse it will blow almost immediately. A slow blow fuse requires higher i2t than fast blow fuses to blow up. For example assume a nominal load of 15 amps and an ambient.

Normally used for inductive loads like fans transformers etc. How slow is slow enough. The uses for a slow blow fuse and a fast blow fuse. But a slow blow one will melt its fuse wire after a specific period within 10 or 15 seconds.

Fast acting fuses should be used in motor circuits will blow more frequently. Selecting a fast blow fuse is fairly straightforward. A circuit designer would use a slow blow fuse when it is desired for a circuit to continue to work even after temporary spikes of current received such as a circuit being hit by lightning. Fuses at work a current can become corrupted or overloaded due to accidental damage from pets or being moved general deterioration excessive overloading of the electrical system or exposure to the elements.

In this article we will discuss fast blow fuse vs time delay fuse. In general the time required for a fuse to blow can be given i2t where i is the current and t is the time. Typical slow blow fuse. By using a slow blow fuse you bypass this problem because as mentioned before.

The types of fuses include long time lag or super time lag tt fast acting fuses ff quick blow fuses f and slow blow or time lag fuses t. The slow blow fuse has thermal inertia whereas a fast blow has a very short thermal time constant. It has an element with a coiled construction and is designed to open only on a continued overload such as a short circuit. Slow blow fuse requires much higher time than the fast acting one.

Many slow blow images here all glass ones that i looked at have spiraled wire.