Fast Blow Fuse Design

Hence the fuses could be blown.

Fast blow fuse design.

The accumulated heat from adjacent sections helps blow the fuse. Yet a fast blow may be subject to nuisance failure due to momentary overload. Some fuses are intended to blow very fast while others are designed for more modest opening times or even for a delayed action. Fuse characteristics can be classified into three general categories.

The slow blow fuse has thermal inertia whereas a fast blow has a very short thermal time constant. The uses for a slow blow fuse and a fast blow fuse. Other inferior fast acting fuses may vary by as many as 1 2 amps meaning your 8 amp fuse might not blow until power spikes to 10 amps. Typical slow blow fuse.

A fast blow fuse will open quickly before wires or traces or devices get too hot. 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. This characteristic of a fuse design refers to how rapidly it responds to various current overloads. Sometimes it is visually less apparent.

Sizing a fast blow fuse to allow the transients would result in a fuse which may not provide protection during some expected fault conditions. Very fast acting fast acting or slo blo fuse. There s more to the current rating of a fuse than a single number. There are many types of fuse and we have already discussed them among them the slow blow fuse a k a.

In this article we will discuss fast blow fuse vs time delay fuse. Here the coiled structure is clear. Time delay fuse and fast acting fuse a k a fast blow fuse are the most popular choice for electronic circuits like smps circuits or other power circuits. The distinguishing feature of slo blo fuses is that these fuses have additional thermal inertia.

If a current of 35 amps is sent through a 30 amp fuse it may blow suddenly or delay before blowing depending on other aspects of its design. The ideal may be both a fast and slow blow fuse in series very unusual and possibly also illegal for regulatory reasons or a circuit breaker with a well defined current versus time envelope.