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What is the suffix TB on the LGA34400WU31XTB Mission Critical breaker?

Issue:
What is the suffix TB on the LGA34400WU31XTB Mission Critical breaker?

Product Line:
Circuit Breakers

Environment:
L frame Mission Critical CB, 600A, Electronic Trip, with factory sealted Trip Units Suitable for Reverse Connection

Cause:
Need replacement breaker 

Resolution:
The TB suffix indicates that the I-Line shroud and jaws are on line side and metric terminal insert nuts for bus or crimp lugs are on the load side of the breaker.
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