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Stephan,
Great Photo, it helps a lot. I had a team open one for me and I think what you refer to as the thermal unit is actually the magnetic unit. I think the thermal is at the top of that assembly, there is a factory adjustment screw at the top accessable behind a label on the breaker. (There was no identification of the parts on the Square D site so I am guessing here.) It is easy to see that the two parts visible in the yellow circle will be forced together with impact on one side, tripping the breaker. Hitting on the opposite side keeps them apart.
Please note that any heat conducted into the breaker through the wires, (especially the left connector) is tied directly to the thermal unit through the internal metal parts.
BTW, we mount the circuit breaker horizontal, the same orientation it was designed for with the #6 wires used to shock mount from the frame.
Hope this helps give teams a clearer view.
Good Luck All
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.
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