Square D™ brand Mini Power-Zone™ unit substation from Schneider Electric provides the answer to requirements for a portable, compact power supply for small loads. The Mini Power-Zone unit substation uses a separate transformer and panel section. This allows the panel section to be removed and wired first if desired. These transformers can be replaced without disturbing the panel section and associated wiring. The new transformer simply slides into the top of the panel section and primary and secondary leads are reconnected to the main circuit breakers. The panel section uses Square D™ brand QO™ style circuit breakers. Use Qwik-Gard™ circuit breakers for required ground fault protection. This Mini Power-Zone Sealed Transformer is a 1 phase, with a primary voltage of 480V and a secondary voltage of 120/240V with 2 tap offs @5 % FCBN taps. This transformer has a box number BB and a insulation temperature rating of 185 °C. These transformers are installed on the interior of the load center that has 28 spaces. With a rated power of 25kVA, it has a short circuit current of 18kA. This transformer has a temperature rise of 115°C and is epoxy-resin encapsulated. The enclosure material is hot-rolled steel and is rated at NEMA 3R. This transformer complies to UL listed standards. This product comes with an 18 month warranrty.