Our electric room product is suitable for port wharf, industrial enterprise , electrics and other equipment ,  matching with crane linkage to control the lifting,  the trolley and crane travel starting, reversing, speed regulation and braking, etc, and providing the protection for crane power supply, short circuit, over current, over voltage, under-voltage, null, loss of phase and phase fault, etcApplicable To Metallurgical Cranes, Port CranesSuitable Supply Voltage 3kv Or 10kvHigh Protection Grade For Indoor Or Outdoor UseSitting Or Lifting UsePure Copper Transformer With Cooling Device