Are there any special circuit breaker requirements for the solar system?
Circuit breakers for solar photovoltaic systems are always recommended to be of the Photovoltaic type "PV". So for MCBs, the recommended solution would be using C60PV-DC (refer to CA901031E.pdf). For higher ratings (56A~80A), it is recommended to use the NSX80 TM DC PV (P/N LV438081). The NSX DC PV range is rated up to 500A (NSX500 TM DC PV). As for C32H-DC and C60H-DC, they could be used as well but they are not recommended for DC photovoltaic installations. Their main use is for general DC applications which do not include photovoltaic installations.