What machine should be for 48V DC circuits?

Dmitry asks:
Good afternoon, tell me please. Power supply equipment 48V, the customer asks to put an 80A single-pole circuit breaker. Why such a big face value? Thank.
The answer to the question:
Hello! If the power supply and wiring allows - why not. It depends on what it supplies ... At a low voltage, a high current, for example the same 100 watts at 48V consumes more than 2A, while at 220 it consumes less than 0.5A
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