-Cutaway before use, that is... Nice.

This is another <200 Amps 400 VAC 3-phase circuit breaker (exploded view) after final use:

Click image for larger version.  Name: Breaker.JPG  Views: 246  Size: 174.3 KB  ID: 32056 Click image for larger version.  Name: Breaker 1.JPG  Views: 273  Size: 330.5 KB  ID: 32057

Pretty decent exterior, right? Opening up by drilling out the rivets shows the mayhem...

Click image for larger version.  Name: Breaker 2.jpg  Views: 234  Size: 252.9 KB  ID: 32058 Click image for larger version.  Name: Breaker 3.JPG  Views: 242  Size: 368.3 KB  ID: 32059

Note the impressive copper blob on the contact point, the heat witness marks & oxidation of the flash arrestors.

"-Just another day at the office."

Cheers
Johan