 First of all, there is no need of a fuse because the 48AV is equipped with
one. However, if the user insists on using his own fuse, check characteristics
of the fuse and replace it with 1A (for example).
 Rush
current is the cause of this problem. Power consumption of a transmitter
is generally less than 100mA. However, when the power is turned on, large
current appears momentarily, called "rush current".
See the following diagram, the primary circuit of 24 Vdc power. The 48AV
is equipped with alarm relay outputs. In order to allow longer momentary
power failure duration, the value "C" is designed much greater
than the one for ordinary transmitters. It results in much greater rush
current. |
A
0.5 amps fuse is 
attached
to the model 48AV-4RV6-R. When power is turned on, the fuse blows. Why? 
