Just wondering if anyone has come across this before.
We installed a 300A 277/480V, 3-phase, 4W service in a building in2000. The distribuition section is a GE Spectra series board. In this boad, we have several circuit breakers among which are 200A SFLA C/B's. (250A frame w/ 200A trip unit) These breakers feed various panels and transformers with the highest load being 160A for a panel feeding battery chargers.
(10) of these 200A SFLA c/b's have what looks like burning or corrosion arount the trip rest button and the trip unit.
We are trying to find out what could be causing this. The other c/b's in the board are fine (both larger and smaller Amp c/b's)
I found an alert regarding GE c/b's and trip units online, but this alert does not appear to cover this type of breaker and the time period in question.
Does anyone have ideas as to the possible cause or a good source where any reported problems might be posted?
I checked the GE site for any info without any success.
Thank You for any input.