![]() It’s never a good plane to assume the fuse that blew was correct. You’ll need to check the correct fuse rating of the circuit. And it’s worth eliminating before presuming you have a more serious problem. It’s really important to get this right.įitting a fuse that’s too small is a super common cause of a fuse constantly blowing. That results in the fuse blowing every time the load is turned on.įitting a fuse that’s too small is an inconvenience but fitting a fuse that’s too large can have devastating effects. The result is excessive heat, burnt wiring, or components.Ĭonversely, if the fuse fitted to the circuit is too small, it will cause the fuse to blow, below the circuit’s capacity. Fitting a fuse that’s too big, would cause excessive heat in the circuitry (when shorted) as the higher rating fuse is designed to handle higher amp draw. ![]() dictate how much heat a circuit will produce.īased on such factors a circuit designer can calculate the correct size fuse. When a circuit is designed, factors such as the size of the load (motor, light, etc.), wire size, wire length, voltage, etc. ![]() ![]() And that’s the fuses job.įuses contain a fine metal strip that’s designed to melt above its rated amp draw. Your circuit needs to be protected from excessive heat. Turning on a light or motor causes energy (known as current or amp draw) to flow in a circuit which also causes heat to occur naturally. ![]()
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