5SHX1445H0001 DC contactor refers to a contactor whose iron core is controlled by a DC coil. Its load can be DC or AC. Unlike AC contactors, the iron core of DC contactors does not have eddy currents, so it is usually made of mild steel or industrial pure iron into a round shape. Since the attraction coil of the DC contactor is supplied with DC, there is no impact starting current and no violent impact of the iron core. This makes it have a longer life and is suitable for occasions with frequent starts and stops. DC contactors are mainly used to connect and break DC circuits over long distances and to frequently start, stop, reverse and reverse brake DC motors. They are also used to frequently turn on and off lifting electromagnets, solenoid valves, clutch electromagnetic coils, etc. Its structure and working principle are basically the same as those of an AC contactor, and it is mainly composed of three parts: an electromagnetic mechanism, a contact system and an arc extinguishing device. When selecting, the operating frequency and coil rated voltage need to be considered. The operating frequency refers to the number of times the contactor switches on and off per hour. When the switching current is large and the switching frequency is too high, it will cause serious overheating of the contacts and even welding.
Therefore, if the operating frequency exceeds the specified value, a DC contactor with a larger rated current should be selected. The selection of the rated voltage of the coil is not necessarily equal to the rated voltage of the main contact. The specific selection depends on the complexity of the circuit and the number of electrical appliances used. It should be noted that the power supply of the controller and the power supply of the contactor are not the same, so the control signal of the controller needs to be isolated to drive the DC contactor and cannot be directly controlled. In practical applications, it should be ensured that the rated voltage of the DC contactor is equal to or greater than the rated voltage of the load to ensure its normal operation and long-term use. In short, the 5SHX1445H0001 DC contactor is an important control component in the power system. It has the advantages of simple structure, stable operation, and long life. It is widely used in various DC circuits and motor control occasions that require frequent starts and stops.
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