If there is a 230-400V indication each winding can hold a maximum capacity of 230V. In a delta connection the total line current of 400V is distributed over the winding, in a star connection this is 230V. Let’s take the example of a 230-400V electrical motor. In delta connections each winding has the same voltage level. In star connections the voltage is distributed over the three windings. Specialist knowledge is required while wiring-up the junction box of large motor drives utilising star or delta connections. These drives are generally applied in 3 phase current three phased connections, with a line current of 400V. The lowest voltage level indicates the motor winding of the motor. Motor’s nameplates with large drives or AC motors generally display an indication such as 230-400V or 400-690V. Companies active in the heavy industry obtain the required voltage level by installing a transformer station, which is subject to strict regulation. Large factories with heavy machine parks and their own transformer station have these connections. A typical feature is that the higher the voltage, the lower the current.Ī 690V connection may use thinner wires, which is cost-saving. Small motors generally have a 230-400V connection. Industrial motors with a power over 4kW generally have a 400-690V connection.
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