The 3 phase base unit with 20 a has been innovated and is only 70 mm wide for the most compact tests in this performance an indication contact for evaluating the operational status is now built and the input voltage area was expanded to 320 575 vac with up to 93 effectiveness of the regulated power supply sitop psu300m 24v20a is extremely efficient and the development of heat in the switchboard and is correspondingly low the extra power with 15 fold nominal current for 5 seconds allow