AC and DC contactor interchangeability

Create Date: 2024-8-30 12:03:23|Source: TURCK/TURCK

1. The AC contactor can be used as a substitute for the DC contactor in an emergency, and the suction time can not exceed 2 hours (because the heat dissipation of the AC coil is worse than that of DC, which is determined by their different structures), and it is really necessary to use it for a long time.

                               AC and DC contactor interchangeability

2. The number of turns of the coil of the AC contactor is small, and the number of turns of the coil of the DC contactor is large, and the volume of the coil can distinguish the case of excessive current in the main circuit (Ie>250A), and the contactor adopts a series double-winding coil;

3. The reactance of the coil of the DC contactor is large and the current is small. If it is said that it will not be damaged when it is connected to the alternating current, it will be released at the right time. However, the reactance of the coil of the AC relay is small, and the current is large, and if the DC is connected, the coil will be damaged;

4. The number of turns of the coil of the AC contactor is small, and the resistance is small, when the coil is connected to the communication current, a large inductive reactance will occur, which is far greater than the resistance of the coil, and the excitation current of the coil mainly depends on the size of the inductive reactance. If direct current is fed in, the coil becomes a purely resistive load, and the current flowing through the coil will be very large, causing the coil to heat up or even burn out. Therefore, the communication contactor cannot be used as a DC contactor.

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