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June 12, 2009
Not to Exceed...
 
 


There are typically three electrical ratings (specifications) for every over-current protective device (fuse / circuit breaker):  The nominal current...the voltage...and the interrupting rating...

Today I want to talk about the voltage rating (I’ll talk  about the other two ratings in a future blog). 

The voltage rating of almost all over-current protective devices is a "not-to-exceed" rating*.  This means that the part cannot be used ABOVE the "rated voltage" of the device...but you CAN use the fuse / circuit breaker at a LOWER voltage.  For example you can use a 250V fuse in a 24V application but you CANNOT use it in any application above 250V.

It’s that simple...

On another note...the OptiFuse Daily Blog archive is now up and running so you can review old bogs at your leisure or you can  send the archive link to customers / colleagues / friends / relatives / old college acquaintances...a link to the archive is posted on the right.

Let’s grow our businesses together...and thank you very much for your continued support and kind words of encouragement...



Jim Kalb
President
OptiFuse
jimk@optifuse.com

* There are some very specific applications - such as fuses used as gated tyristor protection - where the voltage rating is more complex calculation - so this is a general a rule of thumb for ALMOST all electronic / automotive applications. 
 


 

 
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