Electrical Relays

Overview

Electrical relays were invented by Joseph Henry in the year 1835. Electrical relays are defined as a switch that lets you offer either a power source or a ground source to a circuit. There are several types of electrical relay available in the market, but the most familiar type of electrical relay is the Single Pole Double Throw (SPDT) relay and the Single Pole Single Throw (SPST) relay. The Single Pole Double Throw relay is widely used automotive industries, whereas Single Pole Single Throw relay is used in automobile industries. Electrical relays are a form of electrical amplifier that is capable of controlling a higher-powered output circuit. Companies that manufacture electrical products do manufacture electrical relays that include General Electric, Optima Systems, K-Tech Inc., Schneider Electric, and Ross Engineering.

How it Works

Electrical relays come with an electro-magnetic coil that generates a magnetic field when they are energized. These magnetic energized flip switches to link up two terminals. These relays come with main four parts they are an electromagnet, an armature, a spring, and a set of electrical contacts. Electrical relays come with two separate and completely independent circuits. The first switch controls the power to electromagnet and the armature that is the second switch power up when needed. The first switch is located at the bottom that power up the electromagnet, which will magnetize the metal armature. For example if it is a light circuit, the light will be turned on. The spring pulls the metal armature away, when the electromagnet is not powered, which keeps the armature away. Thus the circuit is not complete and the second switch is off.

Benefits

The benefits of electrical relays are numerous. They are used in the starters of automobiles. These relays are used to turn on headlights, fog lights, and tail lights. They are capable of detecting and isolating faults on transmission and distribution lines by opening and closing circuit breakers. It is referred as protection relay that guards from short circuit. Electrical relays are used to perform time delay functions.

Electrical relays are also used as a controlling circuit for several applications such as office lighting linked to room occupancy detectors, which are a great way to save money on electricity. Electrical relays are manufactured in both simple and complex forms this lets you to design high-quality electrical circuits that offer reliable performance.

Costs

Depending on the size and coil, the cost of the electrical relay differs. Mostly, these relays are fairly inexpensive that are available in a wide variety.

Timing

The requirements of electrical relays are increasing day by day due to expansion of industrialization. They considered as part of larger projects, thus, you should carry out a cost-benefit analysis on the project you choose. Do a complete study about the project and understand your requirement before initiating it. These relays are almost used in all industries and help you to save power and money as well.