Circuit Breaker Sizing Quattro 48/3000/35 120V

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gerloffd asked Jul 26, '19

Circuit Breaker Sizing Quattro 48/3000/35 120V

AC-Out-2 has a CB requirement of 25A Max (to the sub-panel for non-ups loads).

-Understood this turns off when UPS powers loads.

What is the CB requirement for AC-Out-1 to the other leg (120VAC) of the sub-panel (UPS supported)?

Is this UPS load dependent? Do I use a 30A CB if I know the load to be <30Amp? Waht is the Max with 50A shore power in.

ac out 2

1

2 |3000

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gerloffd commented · Jul 27, 2019 at 07:13 PM

So the logic is 50A in /2 (1/2 UPS and 1/2 Non UPS Critical load) = 25A per Quattro leg.

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Answer 1 · 2019-07-27T08:41:41Z

Murray van Graan answered · Jul 27, 2019 at 08:41 AM

At max of 3000VA it will be 25A. I’d prefer a 20A breaker at 120Vac. Keep in mind the breaker should be able to protect the cable connected to it. In other words, the cable connected to the breaker should be of an appropriate size to carry the max current that can flow through the breaker

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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