Maretron 12 Circuit Bypass Module NMEA 2K w/Fuse Pack Jumper Wire [CBMD12-R]12 Circuit Bypass Module NMEA 2K with Fuse Pack & Jumper Wire For manual control of the loads, an optional MPower 12 Channel Bypass Module (CBMD12) can be installed in conjunction with the 12 Channel DC Load Controller Module (CLMD12). The maximum current capacity for the CBMD12 is 75 amps in 12V DC and 24V DC power systems. The Bypass Module provides a manual method (ON OFF switch) to control loads by providing power to each load in case of a CLMD12