Phoenix Contact 2907995 A bus bar for TMC 82 is a two-phase circuit breaker configuration featuring an auxiliary switch module with a 17.8mm pitch and up to 46 positions, designed to accommodate UL 508 listed circuit breakers that are also rated for connection with UL 489 rated circuit breakers, capable of handling end feed currents of up to 80A at voltages ranging from 600V AC or DC.