Eaton MEM's Memshield 2 range of MCBs and MCCBs are suitable to operate on DC.

Selecting the Correct Circuit Breaker
In order to select the correct circuit breaker for use on DC, a number of factors need to be considered.

Rated Current:
This will determine the current rating of the circuit breaker, however the Time/Current characteristic will differ to that used on AC applications.

Thermal:
Remains unaffected, temperature de-rating values will remain the same as AC.

Magnetic:
Becomes less sensitive (trip level increases by 41%).

System Voltage:
The system voltage as well as the type of system determine the number of poles in series required to provide the necessary breaking capacity.

Short Circuit Current:
This is the maximum short circuit current at the point of installation, used to determine the breaking capacity required.

Calculation of Short Circuit Current, Battery Systems: Isc = Vb/Ri
Isc is the value of short circuit current. Vb is the maximum discharge voltage (battery 100% charged). Ri is the internal resistance (given by the battery manufacturer).