The DuraComm SM1228 Power Bloc module switching power supply allows you to add to the RM series of DuraComm power supplies to increase voltage amperage or N+1 redundancy for system integrity. This 10 amp power supply features a 110 or 220 VAC switchable input and a 24 VDC output. The DuraComm 3.3 x 5.9 x 5.5 inch Power Bloc module can also be used as a standalone power supply or power supply add-on.