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.