3ph knife switch unfused on 120VAC circuit w/jumper installed from one phase to another

[Isaiah]

I have a cutler hammer three phase non-fused disconnect switch that is being used on a 120VAC circuit to a small motor load. The over current device is at a local 120/208V Panelboard, 20A 1p branch CB. Internally to the switch there is what appears to be a factory installed jumper from the load side of one phase (A) to the line side of another phase (B).
I can’t see why this jumper is required and tempted to simply remove it. Any thoughts?


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[texie]

That is for when it is being used for DC. You can remove it for AC.

 

[infinity]

Yes it's there for when the switch is used for DC circuits.

 

[Isaiah]

Thank you very much for your responses!


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[electrofelon]

I am aware of this for DC as mentioned, but I have never seen the jumper factory installed. Anyone else?

 

[infinity]

What is this?

This is an out of the box 1Ø, 480 volt, 200 amp fused disconnect. Any idea what the #1/0 jumper is for?

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[electrofelon]

So maybe it is standard on 600V 2 pole units? I can't recall a time I have used a 600V 2 pole.