Overload Relay Types

4 how many types of relays are there.

Overload relay types. Definition of overload relay. The overload relay types include fixed bi metallic interchangeable heater bimetallic and electronic. Thermal overload relays there are two major types of overload relays. Overload relays are generally of two types one is electro magnetic and another is thermal.

Many overload relays include bimetallic elements or bimetallic strips also referred to as heater elements. In my earlier post i have alreaady explained the working of relays and their design and construction. Types of overload relays bimetallic overload relay. Overload relay connection diagram.

It senses overloading of motor and interrupts the power flow to the motor thus protecting it from overheating and winding damages. An overload relay is a device that protects an electric motor against overloads and phase failure. Thermal overloads operate by connecting a heater in series with the motor. The amount of heat produced is dependent on motor current.

In this post you will find details about electro magnetic overload relay which is somewhat outdated now days but still some old air compressor units are having these. An overload relay can be tested by injecting specified current into it and then noting the time it takes in tripping. Flexible mounting ensures that they can be installed on a contactor panel or separate enclosure. In this article the different types of relays like overload protection relay solid state relay solid state contactor relay buchholz relay mercury wetted relay and many more are explained with diagrams.

Relays are used where it is necessary to control a circuit by an independent low power signal. Solder melting type or solder pot and bimetal strip type. There are mainly three types of relays. Introduction to relay different types of relays its terminals working applications relays are the essential component for protection switching of a number of the control circuits other electrical components.

All the relays react to voltage or current with the end goal that they open or close the contacts or circuits. The wiring diagram of an overload relay is shown below and the connections of an overload relay symbol may seem like two opposite question marks otherwise like s symbol. The bi metallic strips are made of two types of metals one with a low coefficient of expansion and another with a high coefficient of expansion these bimetallic strips are heated by. Eaton offers a wide range of overload relays to provide full motor protection.

The overload relay working function is discussed below. Thermal overloads can be divided into two types. Although there are several types of overload relays available in the market however the most frequent type of relay is the. This article briefly discusses the relay basics different types.

Comparing it with the characteristics required.