Branch circuit calculation for STS

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orr263

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If a rack mount static transfer switch that is rated for 50A continuous, has 2 60A input fuses and slots for three output fuses up to 30A. What is the maximim size overcurrent for the input. What is the maximum #/size fuses for the outputs?
 
Re: Branch circuit calculation for STS

50A overcurrent protective device max on the input.
(3) 30A branch circuits on the output.
You must manage the load to avoid false tripping.

The output is similar to a 200A panelboard that can contain >1000A worth of branch OCPD's.
 
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