Two-steps start-up contactor

Limit the inrush current on starting up the system to 8 times the nominal input current (15 times as standard).

Addition of a two-steps start-up device to limit the inrush current due to the magnetisation of the transformer. The device uses a timing relay to firstly magnetise the input transformer through resistors. The contactor is then switched to close position to allow starting up the charger part of the UPS.