PowerMark PRO convertible plug-on neutral load centers arrive as main lug but have the capability to have a main circuit breaker installed in the field. All ABB load centers are rated up to 60 degree/75 degree centigrade and suitable for use as service entrance equipment when installed in accordance with electrical code. The PLM3220C features space for 32 - 1" circuit breakers and 64 circuits, a 200-ampere bus rating, copper bus bars, and a gray combination/flush enclosure.