What is a Slow-blow Fuse?

What is a slow blow fuse? A slow blow fuse is a type of fuse that can handle a transient surge of current beyond the fuse’s current rating. The slow blow fuse does not blow for a temporary surge of current; it must receive an elevated current continuously above its current rating for a period of time before blowing. This is why it is called a slow blow fuse. This means that any transient spike will blow the fuse. So the fuse will blow and the circuit will stop working. It has an element with coil construction and is designed to open only under a continuous overload such as a short circuit. A circuit designer would use a slow blow fuse when wanting the circuit to continue operating even after a temporary spike. received current such as a circuit struck by lightning. The slow blow fuse only blows when it receives a sustained surge of current for a period of time, such as a short circuit. Thus, slow blow fuses are not associated with transient transient currents but only causing a continuous overload. A short circuit is a section of circuit in which an unwanted connection is made where part of the circuit can receive more voltage than is needed. For example, suppose that a piece of circuit is powered by 15 volts. The circuit needs these 15 volts for certain parts of it to work. The voltage is distributed when the DC motor gets 12 volts to run while the fan inside it only needs 3 volts. Normally, the circuit would be wired so that the motor gets 12 volts and the fan gets 3 volts. However, as happens many times with (unintended) circuits, the conductors in the circuit or traces of copper wire can create undesired connections. Maybe 3 volts can connect to 12V or 15 volt lines. If this is the case and a slow flowing fuse is connected to it, the fuse will blow to protect against this short circuit. Thus, the fan can be saved. Many times electronic components can receive more voltage than rated and still survive if not left in these conditions for too long. So a slow blow fuse can protect the electronic circuit in this way. The same can be applied to DC motors. It may make an unwanted, intermittent connection to the 15V line. When this is the case, it will eventually blow so that no more current flows to the motor. This can also be a protection mechanism that can save the motor to maintain high surge current levels. Read more: What zodiac sign could it be 8 And this is the kind of application these fuses have. They can protect electronic circuits and save them, because they cut off the sustained current when a short circuit occurs. They do not protect against transient surges (regular ones do), but they do prevent intermittent surges And like regular fuses, they are supplied with standard current ratings . So there are 1 amp, 2 amp, etc slow blown fuses. A 1 amp fuse should be able to withstand transient spikes above 1 amp without blowing and opening. However, if it gets over 1 amp for a period of time, it gives way and blows away. | Top Q&A

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