Hornby Select Power Saver - current protection deviceIf you own a Hornby Select DCC controller then you NEED THIS! If you get a short circuit on your layout for a prolonged time, the controller has the potential to damage itself due to the amount of current flowing through it. We can repair them but we'd rather you prevent the damage in the first place so we came up with this! It fits in seconds, just remove the cable going to your track and insert this little control module, then screw your track cable