Method for improving the electromagnetic compatibility of a relay with a relay coil with a coil beginning and a coil end connected to a relay driving circuit and with a relay switch disposed in a load circuit , the method comprising the steps: wherein a first parasitic capacitance is formed between the coil beginning and the relay switch and a second parasitic capacitance is formed between the coil end and the relay switch , wherein the first parasitic capacitance is different from the second parasitic capacitance , wherein one of the coil beginning and the coil end is connected to ground via a third node and a switch , wherein the other one of the coil beginning and the coil end is connected to a supply voltage via a fourth node , and wherein the switch is controlled by a PWM controller , and the method comprising the steps: determining said first parasitic capacitance ; Determining said second parasitic capacitance ; Determining electromagnetic interference between the relay driving circuit and the load circuit ; and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the relay driving circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the third node , and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the load circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the fourth node . wherein a first parasitic capacitance is formed between the coil beginning and the relay switch and a second parasitic capacitance is formed between the coil end and the relay switch , wherein the first parasitic capacitance is different from the second parasitic capacitance , wherein one of the coil beginning and the coil end is connected to ground via a third node and a switch , wherein the other one of the coil beginning and the coil end is connected to a supply voltage via a fourth node , and wherein the switch is controlled by a PWM controller , and the method comprising the steps: determining said first parasitic capacitance ; Determining said second parasitic capacitance ; Determining electromagnetic interference between the relay driving circuit and the load circuit ; and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the relay driving circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the third node , and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the load circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the fourth node . determining said first parasitic capacitance ; Determining said second parasitic capacitance ; Determining electromagnetic interference between the relay driving circuit and the load circuit ; and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the relay driving circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the third node , and if a source of electromagnetic interference between the relay driving circuit and the load circuit is disposed in the load circuit , the polarity of the relay coil is applied so that the smaller one of the first parasitic capacitance and the second parasitic capacitance is connected to the fourth node . <EOS>