The purpose of capacitor discharge units is to store up electricity in a capacitor. The electrical charge is released, on throwing a switch, as a burst of a much larger current than a transformer can supply.
The CDU can be supplied with either an AC or DC voltage up to 24v. Operating from 24 volts typically gives 4 times the power. In most cases a voltage of 16v AC is ideal to power a CDU. The output of a CDU is always DC. The Standard unit will power up to 4 sets of points simultaneously.
MR210 Capacitor Discharge Unit Standard
MR211 Capacitor Discharge Unit Standard 'U' Assemble Kit
MR212 Capacitor Discharge Unit High Power
MR213 Capacitor Discharge Unit High Power 'U' Assemble Kit