Technical FAQs

Ask a Question

How does a bolt-on breaker bolt to an I-Line bus?

Issue:
What is the difference between the plug-on and bolt-on I-line connection?

Product Line:
I-line Panelboards.

Environment:
I-line circuit breakers made in the United States.

Cause:
Product features.

Resolution:
Refer to attached instruction bulletin 0600DB1004 for detailed explanation of the differences between the connections.  

See instruction bulletin for the specific circuit breaker.  On a bolt-on I-line breaker, there are access holes on the breaker where the plug on jaws are located.  Remove the hole plugs to provide access to the bus clamps.  Tighten the bus clamps to 20 inch pounds or 3 N-m.  Replace the hole plugs to cover the bus clamps.  This applies to legacy breakers only.

Only the FA/H, LA/H, FY QB,QD,QG and Q4 are available in bolt-on construction.  All of the others are obsolete and no longer available.

The bolt on option can not field installed.  For the factory installed option, the 3rd character in part number must be the letters below.
 
Breaker Frame  Suffix
QB,QD,QG E
FA, FH, LA, LH, FY, Q4 B
.
It has a clamp on the I-Line jaws which enables it to meet specs calling for bolted connections.
There is a 20% adder to the price of the breaker for this option.  Bolt-on I-Line breakers will fit into regular I-line interiors with no modifications needed.
Was this helpful?
What can we do to improve the information ?