China Nanfeng Electric

The working principle difference between DC contactor and AC contactor

Depending on the application situation, the choice of AC or DC depends on the coil of the wire. The coil of the DC contactor can only pass DC, and the coil of the AC contactor can only work with AC. Generally speaking, in the AC circuit, the main circuit uses the AC and the auxiliary circuit to take power from the main circuit as a control circuit. Then the control circuit is obviously also AC, so an AC contactor is used. If for a certain application, such as after the AC power failure, the equipment needs to continue to work when the power is turned on, then the power circuit and the control circuit need to be separated, the main circuit is AC, and the auxiliary control circuit is DC. This can be achieved, because DC power is in the event of a power failure Continuously, because the DC is generally obtained from batteries and can be supplied for several hours.
After such a power failure, the equipment stops operating, but because of the presence of direct current, the contactor is still connected. After power is available, the equipment will continue to operate.
Generally speaking, the control circuit usually uses direct current, which is applied to the control and protection of large equipment such as transformers and high-voltage motors. If AC is used, once the power fails, the protection device needs to be activated because there is no electricity and will not operate, so the use of direct current is a guarantee . Of course, in some factories, there are still fewer important things, so communication is used for both control and main circuits.
In addition, the DC contactor should be used in DC as the power circuit. Bifa DC oil pump. This is the motor that guarantees the oil supply to the steam turbine system in the power plant. It is controlled by DC. Its main circuit is DC and auxiliary circuit. Also DC, of ​​course the contactor must also be DC.
Alternating current is used for power equipment, and direct current is used for control and protection of power equipment, as well as emergency lighting.
For parameters such as noise, the AC and DC contactors I have seen are all the noise of poor quality. The internal resistance is different because of the different voltage levels.

Company Profile

Zhejiang Nanfeng Electric Co., Ltd. is a company. With DC contactor as the leading factor, it integrates production, R & D, manufacturing anAn enterprise that can be integrated. Our company is specialized in producing medium load and heavy load DC contactor is suitable for electric forklifts, battery cars, tractors, and excavating. Machine, automobile air conditioner, communication power supply, uninterrupted power supply, electroplating power supply, etc. system The switch control of the integrated electronic control circuit has the advantages of small volume and large load capacity.  Long service life, simple maintenance, wide application range, and well received by users. Welcome.

TEL: +86-577-62797256 62776658


Hot News
How to wire the DC contactor
How to wire the DC contactor

The DC contactor is an indispensable electrical component in the circu

The structure and working principle of DC contactor
The structure and working principle of DC contactor

Civil melting contactors are divided into AC contactors (voltage AC) a

What can be caused by contactor failure ?
What can be caused by contactor failure ?

The contactor is used in our daily work to control whether the equip

How to choose a connector ?
How to choose a connector ?

The operation of a connector will affect the function of the entire de

Recommend Products


+86 13738766933

We value your privacy
We use cookies to provide you with a better online experience, analyse and measure website usage, and assist in our marketing efforts.
Accept All