These breakers from MidNite Solar break their rated amperage load at 300 DC volts repeatedly and with no damage. They can be used in MidNite Solar E-Panels, Combiner Boxes, DC Disconnect Enclosures, and Baby Boxes. They're standard DIN rail mount and fit nearly all array combiners, including Outback Power's.
These DIN rail mount breakers have been evaluated by ETL to 300VDC and are listed for the U.S. and Canada when used in a MidNite enclosure. All of the NRTL listings still apply, making them suitable for use in the solar industry. All MidNite circuit breakers hold 100% rated current independent of ambient temperature.
Always use a properly sized breaker for disconnecting.