Salam To ALL HOW TO USE A FUSE

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I have a load of 12v 1A DC
i want to connect a fuse with this load to escape any loss in case of current fluctuation so plz suggest me a fuse that should be connected and also tell me either it will be connect with DC or AC.
Saituation is as shown here
at which position should i connect the fuse????????????
and what should be the value of fuse??????????
 

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If the purpose is to protect against output over current or short circuit, then connect it between the 12V DC and the load. However this won't protect against, for example, a shorted bridge rectifier. For that, connect the fuse between transformer output and bridge rectifier.

If the purpose is to protect against problems such as shorted transformer winding, etc, connect a fuse between 220VAC and transformer.

Hope this helps.
Tahmid.
 
Thanks u so much for guieding
plz suggest a value of the fuse that shoud be used???????
for example howmany ampere etc
 

If you're going to use the fuse in series with the load, you can use a fuse with rating between 1.5A and 2A. However, remember that a fuse isn't going to be a good overcurrent protection if you require precise (or quick) overcurrent protection. For that you should use an "electronic fuse". What a fuse will protect against is repeatitive excessive overcurrent and short-circuit.

Hope this helps.
Tahmid.
 
Dear Sir whats the diffence between fuse and electronic fuse?????????
Is Zener also used for this purpose toooo?????
 

Zener is used for over-voltage protection, not over-current protection.

By electronic fuse, I was referring to an electronic circuit that functions like a fuse, but works with a current sensor, comparator and MOSFET (or other electronic switch). It could even use a microcontroller. There, the circuit detects the current flowing through and shuts down the output temporarily or latches to stay shut if the current exceeds a reference current.

Hope this helps.
Tahmid.
 
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