The Marshalling box is the master control panel for protection devices. This panel comes with a see-through glass door to allow easy visibility of the instruments and their readings. The panel is situated next to the transformer. It contains OTI or oil temperature indicator, WTI or winding temperature indicator, heater switch, pump control switch, Fan Cooler Control, mcb, and contractors. These panels are used in substation switchyards provided with Terminal Blocks to which control cables are connected.