Overload Relay Types

It senses overloading of motor and interrupts the power flow to the motor thus protecting it from overheating and winding damages.

Overload relay types.

I have already given details about thermal overload relay in past. Thermal overloads operate by connecting a heater in series with the motor. All the relays react to voltage or current with the end goal that they open or close the contacts or circuits. The overload relay working function is discussed below.

The overload relay types include fixed bi metallic interchangeable heater bimetallic and electronic. In this post you will find details about electro magnetic overload relay which is somewhat outdated now days but still some old air compressor units are having these.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. An overload relay is a device that protects an electric motor against overloads and phase failure.

Eaton offers a wide range of overload relays to provide full motor protection. Types of overload relays bimetallic overload relay. 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.

A relay is an electrically operated switch it consists of a set of input terminals for a single or multiple control signals and a set of operating contact terminals the switch may have any number of contacts in multiple contact forms such as make contacts break contacts or combinations thereof. Although there are several types of overload relays available in the market however the most frequent type of relay is the. Thermal overloads can be divided into two types. 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.

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. Flexible mounting ensures that they can be installed on a contactor panel or separate enclosure. 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. Thermal overload relays there are two major types of overload relays.

4 how many types of relays are there. Thermal overload relays magnetic overload relays and electronic overload relays. Comparing it with the characteristics required. The amount of heat produced is dependent on motor current.

Definition of overload relay. There are mainly three types of relays. Overload relay connection diagram. 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.

Solder melting type or solder pot and bimetal strip type.