Puls uf20 481 din rail power supply single phase 48vdc 20a 960w puls uf20 481 this buffer unit from puls has been manufactured to a high standard with a compact design that is ideal for use in panel board installations or other building in applications where a suitable mechanical enclosure shall be provided to fulfil local requirements p the unit stores energy in integrated electrolytic capacitors on occasions when the power supply provides sufficient voltages in case of a mains voltage fa