NFB ( NO FUSE BREAKER )


http://electricisa.blogspot.com/2012/11/nfb-no-fuse-breaker.html
NFB (no fuse breaker) is one component of the electrical safety overload and short circuit. then what's the difference with the MCB?
be patient, we will discuss shortly.
the  function can be seen from the above definition of the meaning of that is, as a means to disconnect ( break ) electrical current when the load handled by the these tools becomes overload or short circuit, or the current through it exceeds that limit has been set at the NFB.

difference between the NFB with MCB is the limit value of current that can be served by both ini.MCB tool used for smaller load is typically modest and still can not diubah.sedangkan NFB has a larger current limit and used to secure his load currents more large and in some types of NFB anyone can set its current limit, of course, the greater the value of the current limit higher price NFB
HOW NFB WORKS 
Under normal circumstances:
after the tool is set current limit permitted. pull the lever to the OFF position and Rev to the ON position, so that an electrical current can flow and supply expenses.
overcurrent / overload / shortcircuit conditions:
electric current that flows through the tool and exceed the specified limits, then the metal bimetallic temperature inside will rise and the curved or bent, so that the contacts will be disconnected and the lever will go to the center position or TRIP. to restore it to its original state should be scaled first lever to the OFF position and then raised to the ON position. of course after checking the load and circuit underneath
HOW TO INSTALL NFB
before we put the NFB we have to count the total electric current  flow on this tools. to calculate the amount of current we can look at the name plate of a load (motor pump) and summing the the amount. then we determine the diameter of the cable conductor cross-sectional area accordingly. then we select the amount of NFB that will be used,
installation of equipment is series assembled on the top of  circuit and before the motor (load).


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