SIMBOX WP Reverse section cover for 18 MW distributor ALPHA SIMBOX small distribution board – optimized down to the last detail. The ALPHA SIMBOX small distribution boards are designed for maximum utilization of space, even in confined conditions. 1. The ALPHA SIMBOX XL offers ample wiring space. 2. A comprehensive package of accessories is available for the small distribution boards. These accessories are compatible with the flush-mounting/hollow-wall distribution board (terminals, cover strips, door locks). Siemens offers a comprehensive portfolio of protection, switching, measuring and monitoring devices, distribution systems as well as switches and sockets for safe and efficient electrical infrastructure in buildings and industry.