The type of DC contactor should be selected according to the type of load current and the weight of the load, that is, AC load or DC load, light load, general load or heavy load.
2. The rated current of the main contact of the DC contactor
The rated current of the main contact of the DC contactor can be calculated according to the empirical formula: IN main contact ≥ PN motor / (1 ~ 1.4) UN motor, if the motor controlled by DC contactor starts, brakes or reverses frequently, it will generally contact The rated current of the main contact of the device is reduced to one level.
3. The rated voltage of the main contact
The voltage marked on the nameplate of the contactor refers to the rated voltage that the main contact can withstand. It is not the voltage of the attracting coil. When using, the rated voltage of the main contact of the contactor should be not less than the rated voltage of the load.
4. Selection of operating frequency
The operating frequency refers to the number of times the contactor is turned on and off every hour. When the on-off current is large and the switching frequency is too high, the contact may be seriously overheated or even welded. If the operating frequency exceeds the specified value, a DC contactor with a rated current of one level should be used.
5. Selection of coil rated voltage
The rated voltage of the coil is not necessarily equal to the rated voltage of the main contact. When the line is simple and the number of used electric appliances is small, the voltage of 380V or 220V can be directly selected. If the line is complicated, the electric appliance is used for more than 5h, and the voltage of 24V, 48V or 110V can be used. A coil specified as 36V, 110V, or 127V).
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