[Al Skierkiewicz]

This is a continuation of a discussion on the Peachtree forum. The main breaker has had some failure issues in the past. These are due to one of two problems. A misaligned part during manufacture causes intermittent operation or an over aggressive team member over tightens the mounting hardware and/or stresses the case before or during a match.
The first can be checked by insuring a firm click when turned on, indicating the internal latch has engaged with the actuating handle. Defective units may not latch properly. A second test is to lightly tap the red button and look for intermittent operation. A misalignment of the bimetal prior to spot welding can cause improper engagement of the electrical contacts.
Mounting produces another set of problems. Most often when mounting the breaker, teams will attempt to mount on an uneven surface. This cause stress related fractures in the case which lead to unreliable operation. Always insure you are mounting on a firm and flat surface and do not overtighten the mounting hardware. As always check all electrical connections and parts after every match using a bright light and another set of eyes. Small fractures in the bakelite case of the main breaker are not visible in normal lighting.