The Square D by Schneider Electric 200 Amp 20-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 22,000 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 overhead service applications. Meets EUSERC Specifications. Surface mount. This CSED is built with a plated, aluminum bus bar that is tested and is compatible with Square D Homeline circuit breakers. Square D Homeline CSED's are designed for the value-minded contractors, remodelers, builders and homeowners. Homeline CSED's are engineered for fast installation and wire savings.