Block steu transformers 230v and 400v to 2 x 24v block steu 100048 the block steu 1000va transformer 230v and 400v to 2 x 24v is a low power on current control safety or isolation transformer with tension spring clamps and dual purpose foot plate for screw and rail mounting ts 35 rail to 250 va as per din 50022 designed with a very good switch on behaviour thanks to reduced starting currents plus high performance for the volume thanks to compact design this high quality tranfsormer al