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Transformers will tend to overheat if the secondary presents no 'load' to the primary. The current going to the engines reflects a load into the primary winding and has a limiting effect on the primary current. A coil of wire has very little resistance and if no load is induced through 'transformer action', the primary current increases. <br /> <br />A well designed 'power supply' will have more than just a transformer and could limit the current allowed in the primary winding. Cheap transformers seldom had enough iron to do a 'cool' job. <br /> <br />Safety considerations would suggest any heat producing product should be disconnected when not in use; sort of like turning the washing machine valves off before going on vacation - who wants to come back to a flooded house.
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