PowerMark Gold convertible load centers arrive as main lug, but have the capability to have a main breaker installed. All ABB load centers are rated up to 60 degree/75 degree centrigrade and is suitable for use with service entrance equipment when installed in accordance with electrical code. The TLM3220C42 features space for 12, 1" breakers, a 125 A bus ampere rating, a full 42 circuit panel, and a combination/flush enclosure.