The Powerware Power Distribution Module (PDM) distributes computer grade power to data processing equipment and other critical loads. The PDM can be easily expanded as power needs change by adding up to two field-installable distribution cabinets. This expands the distribution capacity from 84 up to 252 circuit breaker pole positions. Each Powerware PDM offers a main circuit breaker complete with shunt trip mechanism, an electrostatically shielded, high isolation transformer, and copper bus bars in the distribution panels.