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Oliver Sedlacek
09/26/13 01:50
Read: 967 times
Uk


 
#190037 - Fuses and breakers
Responding to: Raghunathan's previous message
The safety function of a fuse or circuit breaker is to protect the wiring. The appliance (in this case your PSU) should have internal protection for anticipated fault conditions.

It's important to understand the limitations of protective devices. I'm not up on MCBs but I've worked with fuses. Worst case, a fuse will continuously carry 1.7 times it rating, so if you were using a 2A fuse for this PSU, your mains wiring should be rated to carry 3.4A.

I'd also have to say that a 45A inrush current is pretty crap these days. Here in the EU a PSU of more than 70W needs PFC (power factor correction), and PFC supplies don't draw huge inrush currents.

List of 14 messages in thread
TopicAuthorDate
Selecting the right MCB      Raghunathan      09/13/13 07:23      
   Take the D-Type...      Kai Klaas      09/13/13 09:11      
   MCB?        Michael Karas      09/16/13 01:59      
      Miniature Circuit Breaker        Kai Klaas      09/16/13 05:28      
         or "Magnetic", or "Mechanical", or ...      Andy Neil      09/16/13 15:59      
      Abbreviations        Raghunathan      09/23/13 09:26      
         the best way      Erik Malund      09/23/13 10:27      
         Clear Now      Michael Karas      09/23/13 23:50      
         No problem to use them - just be sure to *define* them first      Andy Neil      09/24/13 16:38      
            Good point      Raghunathan      09/24/13 21:57      
               Depends a bit...      Kai Klaas      09/25/13 05:35      
               Input current      Joseph Hebert      09/25/13 09:26      
                  Input current and safety      Raghunathan      09/27/13 06:23      
               Fuses and breakers      Oliver Sedlacek      09/26/13 01:50      

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