Temporary Generator Breaker

FaradayFF

Senior Member
Location
California
Greetings,
Are the rental portable generators come with adjustable output breakers? For example, if I got 50kVA unit, would it have adjustable settings on the breakers which would allow me to set the trip at 100Amp? This would give flexibility with sizing the cable from the genset to the load.

Thanks,
EE
 

Todd0x1

Senior Member
Location
CA
Really depends on the breaker. Some rental units have the ABB SCAE breakers with the electronic trip. Other units have oddball cheap Japanese fixed thermal mag breakers.

I have one that has an interesting scheme to trip the breaker at a lower amperage when in 480v mode, there are CTs run through a motor overload relay which then activates the shunt trip on the breaker.

What cable are you using that needs to be breakered at 100A?
 

hillbilly1

Senior Member
Location
Atlanta,Ga
I think the smaller units like that, do not, at least what I have seen, if they are multi voltage, they may have ct's that monitor for overload, and shunt trip the breaker.
 

Todd0x1

Senior Member
Location
CA
Really depends on the breaker. Some rental units have the ABB SCAE breakers with the electronic trip. Other units have oddball cheap Japanese fixed thermal mag breakers.

I have one that has an interesting scheme to trip the breaker at a lower amperage when in 480v mode, there are CTs run through a motor overload relay which then activates the shunt trip on the breaker.

What cable are you using that needs to be breakered at 100A?
Should have read "Really depends on the generator...."
 
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