Residual current device RCD520 basic RCD type A mounted below

residual current device RCD520 Basic RCD type A load side mounted rated resid. current 0.03...5A at 50/60Hz adjustable tv 0...3000ms 4-pole In=250A Ue=100-480V accessory for: 3VA1 nt-sensitive). 2. Easy mechanical installation of the residual current ammeters direct at the switch. This allows a very compact design.