The Square D 400 Amp 30-Space 40-Circuit Outdoor 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 combination service entrance device features a Ring-type meter cover with a single-phase, 4-jaw meter socket. It is suitable for only underground service applications. Meets EUSERC Specifications. Surface mount or convertible to semi-flush with appropriate flange kit. 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.