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 TLM4220CCU features space for 42, 1" breakers, 200A bus ampere rating, a copper bus, and a combination/flush enclosure.