They are used for switching, protection and power distribution circuit breakers installation. Internal boxes install 18 modules on a single DIN rail. Metal distribution boxes are designed for both. MDC series metal distribution boxes are designed for safe, reliable distribution and control of electrical power as service entrance equipment in residential, commercial and light industrial premises. CCTV outdoor applications where a separate box is e equipment. Fiber Optics Terminal Box Aluminium Alloy. Now with an increased load-bearing capacity of 100 N for mounting on the integrated. Our mission is to meet customer"d5s expectations by providing satisfaction through cost, quality, service, delivery and continuous improvement.