Drive circuit for contactor

The utility model relates to a drive circuit for a contactor. The drive circuit consists of a first power supply circuit and a second power supply circuit; and the output terminals of the first power supply circuit and the second power supply circuit are in power supply connection with the contactor by a switching circuit. The second power supply circuit being a flyback type constant-current switching power supply circuit includes a chopper circuit, a transformer, and a rectification output circuit; the input terminal of the second power supply circuit is connected to an output terminal of an uncontrolled rectifier bridge; and the output terminal of the second power supply circuit is connected with the switching circuit. According to the technical scheme, two paths of power supplies are provided and can provide power for the contactor respectively when the contactor starts to work or is in a long-term holding state. Moreover, a constant low current can be provided when the contactor in the holding state, so that the stable holding state of the contactor can be guaranteed and the service life of the contactor can be improved.