Block rkdrte toroidal isolation transformers 200va block rkd 4002x24 the block rkd toroidal isolation transformer 400va 2 x 115v to 2 x 24v acts a mains transformer for adjustment of the voltage and simple electrical isolation while also acting as a safety isolating transformer for the safe electrical isolation of the input and output sides the transformer may be used to set up protective separation as a protective measure in accordance with vde 0100 and is also suitable for creating se