Not sure what happened as I used an output 12V charging plug. I plugged positive and negative in the right spots in power supply A. Once I plugged it in, the wires sparked and the fuse blew.
I plugged into B with a power strip and it powered up fine. This is a new switch out the box and now had a burnish mark on the faceplate
I will RMA this. Can Anyone good with electrical explain this? There's no reason why it should have sparked
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