This is the NBD-577A AC/DC switching power supply and usually both AC and DC sources are connected to power supply
EXT PSU (External power supply) unit is designed especially for supplying DC+24V to printer, DTE and IME-EME from the ship’s main power source (DC +24V and/or AC 100/120/220V).
The external power supply provides single-phase supply with 50/60 Hz of frequency.
If an interruption (like up or down voltage) or failure of ship’s main power source (AC) occurs then it automatically switches from AC source to DC source.
The supply charges a network of pulses in a sequence of the charging pulses of high frequency.
The NBD-577A external power supply unit from JRC is on stock.
