Block el safety isolating transformers 2 x 9v block el 100 9 the block el safety isolating transformer 100va 2 x 9v is ideal for the safe electrical isolation of the input and output sides the transformer is suitable for creating selv and pelv circuits because of the limit on the output voltage well designed using safety coil bobbin in 2 chamber technology featuring a mechanically protected winding wire feature in the coil bobbin plus very good corrosion protection and low noise thanks t