Block rkdrte toroidal isolation transformers 120va block rte 1002x12 the block rte toroidal isolation transformer 230v to 2 x 12v acts as a mains transformer for adjustment of the voltage and simple electrical isolation and also as an isolating transformer as specified in en 61558 2 6 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 creat