All You Need To Know About DC Contactors

by Sergio Clark
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Contactors are electrical gadgets used for switching like a relay. The difference between a relay and contactor is that they can deal with a lot higher current levels than regular relays, especially DC contactors. This element makes them helpful for portable gear applications. The contactor works by applying a voltage to the coil. By doing so, it makes a magnetic field. The magnetic field moves the contacts to the shut position and completes the entire circuit.

When voltage is expelled from the loop, the contacts automatically opens back up and disengages the circuit. The large contact surface and the high measure of contact pressure permit the contactor to deal with the higher in-surge flows ordinarily found in the portable gear markets.

Facts About DC Contacts

DC Contactors are made up of high current switch and a solenoid in a single area that is enclosed. The switch gives the ideal capacity to turn current flow on and off. DC contactor companies are tasked with the role of giving a strong and efficient method of turning the switch to high currents, especially in low voltage DC circuits.

Components of a DC contactor

A DC contactor is made up of the following parts;

a. The contact system- this part is the one that carries current. There are two types of contacts on a DC contactor. The main and auxiliary contact. The auxiliary contact consists of a fixed and movable contact as well as a shaft.

b. Electromagnetic system- this part is made up of the coil, movable iron core, yoke, and a conductive magnetic sheet. The role of the coil is to act as the driving force. They are located close to the contacts.

c. Arc extinguishing system-  this part uses a blowout coil to lengthen and move the electric arc.

Applications of DC contactors

Properly manufactured DC contactors are appropriate for applications, including voltages up to 48VDC. The current limit fluctuates by the group with an inrush limit being at 800 amps. On the other hand, continuous ones convey limits arriving at 225 amps, especially for the bigger units.

Sectors that use DC contactors include horticulture and development, yard and garden, marine, hydraulic companies, heavy-duty trucks, and electric vehicle manufacturing companies, among several others. DC contactors must be deliberately chosen while paying attention to current levels, and voltage levels of their planned application. Environmental factors also influence selection.

Note That:

Different types of DC contactor are used for different applications. However, accurately coordinating a DC contactor to an application requires appropriate thoughtfulness. You must pay attention to various subtitles that characterize the way the devices operate. The main factors to consider fall under three significant divisions. The divisions are; voltages flow and natural variables.  


Defining the application of the device adequately can be a difficult errand. It, therefore, takes a lot of work to come up with specifications for the applications. The effort that it takes is legitimized by the fact that its precision is of critical significance. It allows for accomplishing good strength and life span with the most conservative structure.

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