Incorrect connections of electrical motors have huge consequences. INCORRECT CONNECTIONS OF ELECTRICAL MOTORS HAVE HUGE CONSEQUENCES In this way your electrical installation will not get overloaded. In high-voltage appliances we advise you to apply a softstarter or frequency switch allowing the motor to start using less current. If you start an electrical motor the nominal load can be twice as high in star connections and even 6 to 7 times higher in delta connections.Ī motor protection switch (MPS) bridges the short peak current without cutting off the current. To ensure that your electrical installation can handle this load it is recommendable to limit the starting current surge. The star-delta connections determine the starting voltage levels. Motors with a high starting voltage draw high peak current at starting-up. LIMIT STARTING VOLTAGE IN STARTING-UP MOTORS If the electrical motor indicates 400-690V, each winding can have a maximum capacity of 400V and in a line current of 400V the electrical motor can be delta connected. In a line current of 400V the electrical motor will have a star connection. 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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