UL497B, Dataline,RS232, RS485, 12V, Imax 20kA, In 5kA, 1-pair, Dedicated Shield, Ground protection, Replaceable Module, Circuit disconnect upon module removal
UL497B/UL121201, Dataline,Leased Line 4-20mA, 24V, Imax 20kA, In 5kA, 1-pair, Dedicated Shield, Ground protection, Replaceable Module-Hazardous Location Rated-Class I, Div.2, Groups A, B, C & D