Shunt

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Dmccaffrey

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An electrician called me today informing me that he has a GE THQB1120STI 120v shunt breaker to wire to a fire panel that is controlling 480v equiptment. I am under the impression that he needs either a 480V shunt breaker or a kit for the breaker. I have only received 2 drawing from the rep with this comment but i can't find a way to paste them on this thread.

WHEN A SHUNT TRIP IS ADDED TO A Q-LINE BREAKER, IT'S SIZE IS INCREASED BY ONE POLE, CAUSING A 1-POLE BREAKER TO LOOK LIKE A 2-POLE, A 2-POLE LIKE A 3-POLE, ETC. THEREFORE, THE CUSTOMER WILL NEED SPACE IN THE PANELBOARD FOR ANOTHER POLE IN ORDER TO ACCOMODATE THE ADDITION OF THIS ACCESSORY.

thanks

for any advise in advance
 
shunt

shunt

`Sorry' i meant to ask if i was under the correct assumption that the shunt would have to be 480v breaker if the equiptment is being fed by 480
 
Dmccaffrey said:
`Sorry' i meant to ask if i was under the correct assumption that the shunt would have to be 480v breaker if the equiptment is being fed by 480
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No. The shunt coil is independent of the voltage on the power contacts. 120VAC is a common shunt trip voltage.
 
shunt

shunt

from what I'm reading in the catalog this breaker is rated 120/240 with a 120Vac interrupting Rating at 10kA
 
The shunt-trip breakers I've seen almost always have a single coil rated for a range of 120 through the breaker voltage rating, including 480v.

They're also intended that the trip voltage be immediately interrupted, either by being supplied through the breakere itself, by internal auxillary contacts, or by design of the tripping circuit.
 
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