The Schneider Electric EZAPLUG3H is a 3-pole plug-in base rated for 100 A, designed to accept EZC100 or CVS100BS series circuit breakers in the 60 A to 100 A range. It serves as the fixed mounting and power-connection interface inside a panel — the breaker plugs onto it, so busbar or cable terminations stay undisturbed when the breaker is pulled for service or swap.
The 100 A rated current is the maximum continuous current the base is designed to carry — match it to the breaker's frame rating, not the load. The 3-pole configuration covers three-phase circuits; single-phase or DC installations need a different pole count. The plug-in mounting mode means the breaker slides onto this base without hardwiring the line/load connections — speeds changeouts on a live panel if the breaker has a Racking handle, though standard practice is to isolate upstream first.