SIMBOX Universal WP Safety cylinder lock 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).