Electromagnetic Relays
Electromagnetic relays are small components that play a huge role in the efficient operation of large electronic and electrical power systems, as well as more small circuits. It is defined as a device in which small amount of electrical control current or input control power is used to control the larger amount of output. This type of relay is powered by electromagnetic coils, that when energized or de-energized, cause a switch in its contacts to open or close a circuit.
The electromagnetic relay can be embodied in either a solid or a liquid form. It is constructed with either a circuit of conducting wire or a permanent magnet. When current is introduced to the relay, it activates an armature which opens or closes the contact points, depending on the type of relay used.
The most common types of electromagnetic relays are solid state, AC and DC relays. Whena conductor, such as a metal bracket, is located in a magnetic field, it produces a mechanical force called an electromotive force. When the electromotive force is applied to an armature, the relay is then activated. The armature then causes the contact points of the relay to switch, either opening or closing the circuit.
Different types of relays are available to fit many different types of applications. The most popular type of relay used in electronics and electrical systems is the relaining contactor. This type of relay is ideal for controlling high current or voltage applications, as its contact points can be made from a stronger material than those of the other types of relays.
The electromechanical relay is also very popular in certain applications, as it has the advantages of an electromagnetic relay, plus a greater range of contact points with various forms of switching capabilities. These relays are also popular in special safety applications, as they can be used to control hazardous materials and high voltage systems, as well as in emergency shut down systems.
In the last few decades, electronic components have become more sophisticated, using more advanced technology. As such, electronic relays are becoming more popular in both the industrial and consumer electronics markets. These types of relays use solid state technology, meaning that they do not require an armature to close its contact points, but instead rely on micro-circuit contacts to do this job.
Instrumental relays are also popular, as they are used in a variety of applications in industries such as natural gas, industrial control, research and automation. Instrumental relays make use of instruments to measure a variety of things, such as, temperature, pressure and current. They can also be used to provide digital signals.
Regardless of the type of relay, all types of electromagnetic relays are used in a variety of applications, from mini circuits to industrial control systems. The safety, efficiency, and overall quality of many electronic and electrical systems rely on reliable performance of the electromagnetic relay. Thus, it pays to understand the different types of relays available and their uses, so as to ensure safe and efficient operation in every situation.
