This is a cross reference between Prosurge’s Surge Protection Device model with OBO’s Surge Protection Devices model. This is only for reference, please consult us when in doubt. OBO Model No PROSURGE Model No MCD 50-B 3+1 G50/255/3PN100 MCD 50-B 3+1-OS G50/255/3PN100 MCD 50-B 3 G50/255/3P MCD 50-B 3-OS G50/255-F/3P MCD 50-B G50/255 MCD 50-B-OS [...]