The Square D 100 Amp 16-Space 24-Circuit Combination Meter Socket and Main Breaker Load Center is suitable for use as a combination service entrance device (CSED). This unit is ANSI certified and UL listed with a maximum 10,000 AIR. The ring type unit is intended for use as a combination meter socket and main breaker load center. It is suitable for overhead or underground service applications. Meets EUSERC Specifications. This CSED is built with a plated, aluminum bus bar that is tested and listed only for Homeline circuit breakers. Homeline CSEDs are designed for the value-minded contractors, remodelers, builders and homeowners. Homeline CSEDs are engineered for fast installation and wire savings.