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Active Fuse
Line voltage is basically AC voltage (Alternating Current) . Mention
as alternating because the value is not fixed but always changes with time,
following sinusoidal pattern, as can be seen on graph bellow.
I live in Indonesia so I use 220V 50Hz as example on following
graph.
Every cycle of line electricity always starts from zero point,
then goes to the first peak value which is called positive peak, back again
to zero value, then goes to the second peak called negative peak, and finally
returns to zero point
This cycle occurs continuously, for countries with 50Hz of electric frequency,
this cycle occurs 50 times per second, and for countries with 60Hz of
electrical frequency, this cycle occurs 60 times per second.
In this world there are basically only two types of electrical frequencies
namely 50Hz and 60Hz.
When the audio equipment is turned on manually, the value of the line
voltage can be in various possible positions on the line electricity
graph above.
The most desirable timing when the audio equipment is turned on is when
the value of the line voltage is at zero point, because when the equipment
is turned on at this point the starting current will be minimum or close
to zero and the MCB (miniature circuit breaker) in our home will
not turn off.
On the other way, if the equipment is turned on when the line voltage
is at Peak position, either at Postive Peak or Negative Peak, the starting
current will have a maximum value, and if your equipment has a large power
consumption, then there is a possibility that the MCB in your home will
turn off.
Active Fuse works on the principle of Zero Crossing Contact. When Active
Fuse is turned on, it does not directly connect line electricity to the
equipment, but it will monitors first whether the line electricity
value is at zero point or not, if it is already at zero point, then
line electricity is connected to the equipment, so that the MCB at home
is not will turn off.