QO meter main devices are used in residential applications where local codes require service disconnects to be located outside the dwelling. They include the utility meter socket and factory installed and/or provisions for field installation of service disconnect(s) to feed downstream devices. Meter mains are surface mount and typically used with interior mounted sub feed load centers. This meter main is ring type at a 100 A Main breaker rating and 125 A line rated current. It has a hub type of B with service disconnect already installed and a short circuit rating of 10 kA. Service feed can be underground or overhead.