How to select dc contactor

Publisher： Apollo / 2021-07-22/ Views：1064

Select according to the type of load current in the power supply circuit. Communication DC load should use DC contacter, DC load should use DC contacter, such as chestnut automatic control system is mainly communication DC load, DC motor or DC load volume is small, can also use DC contacter to operate, but the rated voltage of the contact point should be greater.

The rated voltage of the main circuit breaker of the high-grade DC contactor shall be equal to or exceed the rated voltage of the load.

The rated voltage of the main circuit breaker of the contactor to be used should not be less than the rated voltage of the load power supply circuit, and can also be selected according to the motor operated to the high power. If the contactor is used to operate the motor's regular operation, positive and negative or connected to the reverse braking system and other places, the main electric shock accident flow of the contactor should be reduced application, generally can be reduced by one level.

Dc contactor

Define the standard voltage and auxiliary contact capacity of the suction coil according to the control loop specification

If the operation route is very simple and the total number of commonly used contactors is less, the rated voltage of the DC contactor coil is generally immediately used 220V or 380V. If the operation route is very complex, the application of household appliances and more, in order to better safety, the rated voltage of the coil can be selected low, this time must add a control transformer. The rated voltage of the DC contactor coil shall depend on the condition of the control circuit. And a series of contactors with the same volume level, the rated voltage of the coil has a variety of, can choose the rated voltage of the coil and dc control loop working voltage consistent. The coil of the DC contactor is added dc voltage, and the coil of the DC contactor is generally added DC current. Sometimes in order to better improve the larger actual operating frequency of the contactor, the DC contactor is also selected to use the DC coil. If the dc voltage coil is added to the DC current, because the obstruction is very large, the current flow is too small, the contactor usually does not pull. If the dc current coil is added to the DC voltage, the resistor is too small and the current flow is too large, the coil will be burned.

The type of load current in the power supply circuit is selected according to the type of contactor. Communication DC load should use DC contacter, DC load should use DC contacter, such as chestnut automatic control system is mainly communication DC load, DC motor or DC load volume is small, can also use DC contacter to operate, but the rated voltage of the contact point should be greater.

The rated voltage of the secondary contactor main circuit breaker shall equal or exceed the rated voltage of the load.

The rated voltage of the main circuit breaker of the contactor to be used should not be less than the rated voltage of the load power supply circuit, and can also be selected according to the motor operated to the high power. If the contactor is used to operate the motor's regular operation, positive and negative or connected to the reverse braking system and other places, the main electric shock accident flow of the contactor should be reduced application, generally can be reduced by one level.

Dc contactor

Define the standard voltage and auxiliary contact capacity of the suction coil according to the control loop specification

If the operation route is very simple and the total number of commonly used contactors is less, the rated voltage of the DC contactor coil is generally immediately used 220V or 380V. If the operation route is very complex, the application of household appliances and more, in order to better safety, the rated voltage of the coil can be selected low, this time must add a control transformer. The rated voltage of the DC contactor coil shall depend on the condition of the control circuit. And a series of contactors with the same volume level, the rated voltage of the coil has a variety of, can choose the rated voltage of the coil and dc control loop working voltage consistent. The coil of the DC contactor is added dc voltage, and the coil of the DC contactor is generally added DC current. Sometimes in order to better improve the larger actual operating frequency of the contactor, the DC contactor is also selected to use the DC coil. If the dc voltage coil is added to the DC current, because the obstruction is very large, the current flow is too small, the contactor usually does not pull. If the dc current coil is added to the DC voltage, the resistor is too small and the current flow is too large, the coil will be burned.