Relevadores: What Are They and How Are They Used? (2023)

Relevadores, also known as relays, are electronic devices used to control electrical circuits and perform a wide range of tasks. These devices allow electric current to change from one location to another with the help of a control system, offering high-pressure control, versatility, wide coverage, and increased energy efficiency. A relevador is a device whose main function is to control an electrical circuit. It is composed of an electromagnet, an induction coil, a control contact, an output contact, a holding coil, and an activation coil.

How Do Relevadores Work?

Relevadores work by using an electromagnetic coil to create a magnetic field around the activation coil. When the activation coil receives a signal, it moves towards the electromagnet, closing the control contact and opening the output contact. The output contact can be used to control an external circuit. Relevadores can be used to control the direction of current flow as well as the power of the circuit. These devices are used in many electronic devices such as televisions, audio equipment, and computers. They are also used in the automotive industry to control motor direction .

Types of Relevadores

There are various types of relevadores, which can be divided into two main categories: current-controlled and voltage-controlled relevadores. Current-controlled relevadores respond to a variation in current with respect to a set value. They are typically electromechanical devices that provide isolated electrical circuits for protection, regulation, or control. Current-controlled relevadores can be classified as follows:

  1. Steady-State Relevadores: These relevadores maintain a steady state without any change when the current is constant.
  2. Variable-State Relevadores: These relevadores can change their state in response to small changes in current.
  3. Electromechanical Relevadores: These relevadores function as relay switches that close or open a circuit activated by the movement of an electromagnetic coil.

Voltage-controlled relevadores respond to a variation in voltage with respect to the set value. They can also be classified as follows:

  1. Zero Crossing Relevadores: These relevadores detect when a voltage crosses zero and are often used in circuits where motorizations are controlled.
  2. Comparator Relevadores: These relevadores compare two input signals to determine if one is above or below the assigned value.

Each type of relevador has its own characteristics and applications, fulfilling the function of regulating and controlling electrical circuits.

Applications of Relevadores

Relevadores are used to isolate current between two devices and control the power of a circuit. These tools allow electric current to pass from one point to another with different power levels. This means that users can control and modify the voltage without complications. Relevadores are used to perform tasks automatically, such as starting a circuit, turning it off, and/or regulating its intensity. These tools can control complex processes in industrial control or specific mechanisms such as water heating in a house. They can also be applied to protect electrical devices from overheating.

Some of the main functions of relevadores include:

  • Controlling electric current
  • Measuring voltage values
  • Isolating electrical devices
  • Sensing circuit status
  • Allowing safe motor startup

The use of relevadores ensures better control over electrical systems, providing greater safety and effectiveness in managing all related processes.

When Are Relevadores Necessary?

Relevadores are electromechanical devices that are very useful for ensuring electrical direction in equipment and controlling electrical loads, such as motors, lamps, and appliances. These devices play an important role in closed circuits, as they allow for the connection and/or disconnection of different electrical elements through magnetic forces. In other words, relevadores are used to automatically open and/or close electrical circuits in a controlled manner. This offers the advantage of operating circuits safely and efficiently without technical failures or overloads. Therefore, it is recommended to have relevadores in various situations:

  • When the state of an electrical circuit needs to be changed periodically.
  • To open or close devices with a current higher than the limit that a switch can handle.
  • In situations where manual control is impossible.
  • To clear an overload in an electrical device.
  • To regulate the power of a water pump.

Relevadores are electromechanical devices that can be used to control and ensure the proper functioning of electrical circuits. In electrical applications, these devices are highly useful for ensuring a safe and efficient working environment.

Components of a Relevador

The main components of a relevador include:

  1. Relevador Core: The relevador core is a U-shaped magnet composed of iron sheets whose ends are connected by a bar. This movable bar is connected to a contact or contacts.
  2. Relevador Coil: The relevador coil is a drum-shaped coil that produces electromagnetic energy. This is achieved by passing an electric current through the windings of the coil.
  3. Normally Open Contact (NO Contact): The normally open contact does not carry current unless the relevador is activated.
  4. Normally Closed Contact (NC Contact): The normally closed contact carries current constantly unless the relevador is activated.

The operators are devices necessary to activate or deactivate the relevador, and they always serve the same function. The operators can be manual push buttons, switches, sensors, etc. These are the main components of a relevador .

Benefits of Using Relevadores

Relevadores are valuable safety equipment for electrical systems. These devices control and manage electric current, preventing problems from causing harm to people, equipment, or electrical components. Some of the benefits of using relevadores include:

  • Operation under different voltage levels.
  • Optimization of energy expenses.
  • Efficient protection of electrical equipment.
  • Improved efficiency of electrical equipment.
  • Reliable control of electric current.
  • Excellent price-to-quality ratio.

Using a relevador as part of an electrical system contributes to preserving the safety of equipment, electrical components, and all individuals working near the system. Additionally, relevadores do not require expensive maintenance, which is a significant advantage for any electrical project.

Verifying the Proper Functioning of a Relevador

Verifying the proper functioning of a relevador can be a somewhat complicated task, and the verification method may vary depending on the type of relevador. However, there are some general steps that apply to any type of relevador:

  1. Ensure that the relevador is correctly installed in its mounting area. This includes proper voltage, polarity, and cable connection.
  2. Once installed, make sure to configure the device correctly. For example, change the settings to obtain the correct current and select the required contact type.
  3. Measure the resistance of the device's contacts. This will help determine if the relevador is operating properly.
  4. Verify the stability of the voltage. Use a multimeter to measure the voltage applied to the device.
  5. Perform physical tests on the device. Check the range of motion of the switch, the strength of the spring, the response of the turn counter, the operation of safety mechanisms, and the response speed of the device when it receives voltage.

By performing these tests, you can ensure that the relevador is working correctly. It is also recommended to perform resistance and insulation tests before using the relevador to ensure the device is safe.

Relevadores are electrical devices with a variety of uses. They are a type of automatic switch that receives a small amount of energy as a signal and generates a response in an electrical circuit, providing additional safety to prevent problems such as overloads, short circuits, and unforeseen events that could damage equipment. In general, relevadores are used in many electrical systems, such as motor control systems, access control, heating systems, electromechanical equipment, signal processing, electric trains, and safety circuits. Relevadores are versatile electrical components used to ensure the safety and proper operation of most electrical systems.

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