Looking for 200-ampere main breaker
Three solid weeks of triple-digit temperatures and running the air conditioner full blast has taken its toll on my main circuit breaker. I noticed yesterday that the entire box was warm to the touch. I took off the front cover, and discovered that the problem is the main 200 amp breaker. It hasn't tripped, but one of the wires coming in from the meter was hot to the tough. In fact I could (carefully) touch the wire terminal with a wet finger, and it would sizzle just like on a clothes iron. I measured the voltage drop at the terminals, and they all checked out OK, but across the breaker itself, there is anywhere from 150 to over 500 millivolts of drop. This is on just one side of the line. The opposite side shows only about 5 to 15 millivolts drop across the breaker. The main entrance wire got so hot it actually burnt off about 2" of the insulation near the breaker from conducted heat.
As expected, when I called several local electrical parts suppliers, no-one had a replacement breaker. The original was installed in about 1970, so at 37 years old, the part is "obsolete", even though the company is still in business. One more case of a replacement part becoming unavailable about when the original gets old enough to need replacement.
I flipped it on and off a few times, and evidently it is making better contact now and although it is still running hot, is no longer hot enough to fry spit, but I need to replace it ASAP.
Just in case someone might happen to have a new-old-stock one lying around, it is a Square D type Q2MT, rated to trip at 200 amps, with 10,000 amp SYD (surge).
Nothing found on the Square D website. Anyone know where I might order one online?