Two pack of BT2.
When any short circuit happens on your DCC powered
model railway, there is a rapid collapse of track voltage followed by a
voltage spike that is approximately 3 times the original rail voltage…
On a larger scale layout or one with some higher voltage European DCC
systems, this can be as high as 65 volts! This is enough to cause
incremental damage to decoders and is one of the primary reasons for
spontaneous decoder failure.
The BT2 stops this problem and also acts to
smooth the DCC waveform in general use, ensuring better data
communication and reliable running.