Common contactors include AC contactors and DC contactors, which are used for power, power distribution and electric field connection. What are the differences between AC contactor and DC contactor? Can they be interchangeable?
Here are the differences as followings,
1. Different iron cores
Eddy current and hysteresis loss will appear in the iron core of AC contactor, which is mainly formed by stacking insulating silicon steel sheets, generally in E-shape. However, the iron core of the DC contactor is made of a whole piece of mild steel, which is often made into a U shape, without core loss.
2. Arc extinguishing system
The arc extinguishing system of AC contactor is grid arc extinguishing device, and the DC contactor is magnetic arc extinguishing device.
3. Coil turns
AC contactor coil is connected with AC, and AC circuit is used for breaking. The DC contactor is divided into DC circuit and connected with DC power.
4. Operating frequency
The starting current of AC contactor is larger and the cost is lower. The DC contactor has high frequency and high cost.
Are AC and DC contactors interchangeable?
1. In case of emergency, the AC contactor can temporarily replace the DC contactor, but the pull in process can only be within 2 hours. If it is to be used for a long time, it is recommended to string resistance in the AC coil. However, DC cannot be replaced by AC contactor.
2. Because the coil turns of the AC contactor are relatively few, the contactor can be connected in series with double winding coils in case of excessive current in the main circuit.
3. The coil current of DC relay is relatively small and the reactance is relatively large. If AC is connected, it will be switched on and off. If DC is directly connected, the coil will be damaged. If direct current is directly applied, the coil will be a pure resistance load, and the current will increase at this time, causing the coil to heat up or even burn out.
Conclusion: the difference between AC contactor and DC contactor is introduced here. I hope it can help you. For more relevant knowledge, please continue to pay attention to our website. More wonderful content will be presented to you in near future.
