Blind cover strip 12 HP gray with increased flame protection for SIMBOX small distributors Small distributors ALPHA SIMBOX - optimal down to the last detail. The ALPHA SIMBOX small distributors are designed for optimal use of space even in tight spaces. 1. The ALPHA SIMBOX XL offers generously dimensioned wiring spaces. 2. The small distributors are characterized by an extensive accessory package that is compatible with the flush-mounted distributor/hollow-wall distributor (terminals, cover strips, door lock).