These are either a 175 amp or 250 amp (BR-DC250) UL listed, high interruption capacity, 160 VDC rated circuit breakers. They are used on the MP and MMP enclosures as the inverter’s DC disconnect switch.
These breakers have front accessible connections using 3/8" bolts and include two tinned copper extensions, each with a 7/16" hole. They were specifically designed to work on the Magnum Panel with Magnum inverters to provide a long enough response time to minimize nuisance tripping.
These breakers are also provided with the MPX extensions.