KPS-50SW Power Supply, for example

KPS-50SW
Power Supply: A high-performance switching power supply with a backlit control panel (switchable voltage/current) and a temperature-controlled fan;
nearly silent at low load (e.g., standby mode).
The maximum load is 50 A and the continuous load is 45 A,
In addition, the power supply has a frequency-shifting option (to eliminate interference)
. All controls are located on the front panel, and the IEC power connector and DC input are on the rear panel.
The built-in temperature-controlled fan barely runs under low load and is therefore nearly silent.
The circuitry of this device is designed for the operation of radio equipment and receivers and is accordingly resistant to high-frequency radiation; it
also features a protective circuit, short-circuit protection, and a 50-amp limit.

Specifications:
Input voltage: 220V
Output voltage: 9–15VDC
Fixed output voltage: 13.8VDC
Output current: 50 A
Voltage ripple: ≤80 mVp-p
Dimensions (cm): 19.5 x 8.5 x 28
Weight: 2.5 kg
Protection: Short-circuit protection, current limiting.