What Size Circuit Breaker should be used with the MEAN WELL DDR-120B-48?
We were contacted by a customer wanting to use the MEAN WELL DDR-120B-48 to convert a 24V source to power a 30W, 48V power injector for another piece of equipment.
The customer wanted advice on an appropriate circuit breaker for the system and wanted some advice on current draw.
They wanted to know if they should base the current draw on the 30W/48V=0.625A or should they take the typical DC current from your datasheet (5.6A @ 24V).
Based on the presumption the customer wanted a circuit breaker on the 24V input to the DDR-120, we suggested a DC breaker of 2 to 3 amps. This will allow for any inrush current on startup and protect the circuit in case of a short on the output.
Please do not hesitate to contact Power Supplies Australia if you have a question about using a MEAN WELL power supply.