MidNite Solar's MNEPV30-300 breaker breaks a 30-amp load at 300 DC volts repeatedly and with no damage. It has been evaluated by ETL to 300VDC and is listed for the U.S. and Canada. All of the NRTL listings still apply. All MidNite circuit breakers hold 100% rated current independent of ambient temperature. Always use a properly sized breaker for disconnecting.