HC-3/12VDC

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Power Relays, Over 2 Amps

HC-3/12VDC is a power relay providing two amps of current in the 12VDC field of application. This relay can be used in a variety of applications where the main purpose is to control or monitor voltage levels. The relay can also be used to activate or de-activate other electronic systems. Generally, the HC-3/12VDC power relay consists of a control circuit board, a metal contact, a resistor, and an opto coupler. Here we shall understand how each part works.

Control Circuit Board

The control circuit board is the main component of the power relay. It is responsible for deciding when the contacts in the relay should open or close. A transistor is used to control the contacts of the relay. It takes in an input signal from a controlling circuit, and then based on that signal, it opens or closes the relay contacts.

The control circuit is configured such that when the input signal is held high, the transistor closes the relay contacts. Similarly, when the input signal is held low, the transistor opens the relay contacts. This allows the user to control when the power relay should open or close.

Metal Contact

The metal contact is the “load” part of the power relay. That is, it carries the actual load voltage and current. This component is also responsible for connecting the control circuit to the actual load voltage/current. It is a simple part, but it is essential for the operation of the power relay.

Resistor

The resistor is used to control the current flowing through the contact. It is connected in series with the power relay’s control circuit, and its resistance value is adjusted such that it limits the maximum current flowing through the relay. This helps avoid any damage during operation, and further ensures the safety of the worker.

Opto Coupler

The opto coupler is used to isolate the control circuit of the power relay from the actual load voltage/current. This helps reduce the risk of any current leakage from the load side to the control side. As the opto coupler utilizes light to transmit signals between the two circuits, it ensures complete isolation between the control and the load side. This feature makes it a very useful component.

Working Principle

The working principle of the HC-3/12VDC power relay is quite simple. In essence, it works based on a simple electrical circuit. The input signal from the controlling circuit is fed to transistor. This transistor then opens or closes the relay contacts depending on the status of the input signal. When the input signal is held high, the transistor closes the relay contacts, thus allowing the load voltage/current to flow through the contacts. Similarly, when the input signal is held low, the transistor opens the relay contacts, thus stopping the load voltage/current from flowing.

In addition to the above components, the HC-3/12VDC power relay also includes various protective components such as surge suppressors, fuses, and built-in overvoltage protection. These components ensure that the power relay continues to operate properly even under unexpected circumstances.

Conclusion

HC-3/12VDC is a powerful power relay that provides two amps of current in the 12VDC field of application. It consists of a control circuit board, a metal contact, a resistor, and an opto coupler. The control circuit board decides when the contacts should open or close, while the metal contact carries the actual load voltage/current. The resistor limits the current flowing through the contact, and the opto coupler ensures isolation between the control and the load side. All these components work together to form a reliable and safe power relay.

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