Overload Relay Types

Thermal overload relays magnetic overload relays and electronic overload relays.

Overload relay types.

This article briefly discusses the relay basics different types. In this post you will find details about electro magnetic overload relay which is somewhat outdated now days but still some old air compressor units are having these. The amount of heat produced is dependent on motor current. Overload relays are generally of two types one is electro magnetic and another is thermal.

Relays are used where it is necessary to control a circuit by an independent low power signal. The overload relay working function is discussed below. Although there are several types of overload relays available in the market however the most frequent type of relay is the. Thermal overload relays there are two major types of overload relays.

It senses overloading of motor and interrupts the power flow to the motor thus protecting it from overheating and winding damages. In my earlier post i have alreaady explained the working of relays and their design and construction. There are mainly three types of relays. 4 how many types of relays are there.

Types of overload relays bimetallic overload relay. An overload relay is a device that protects an electric motor against overloads and phase failure. 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. Definition of overload relay.

All the relays react to voltage or current with the end goal that they open or close the contacts or circuits. Comparing it with the characteristics required. 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. Flexible mounting ensures that they can be installed on a contactor panel or separate enclosure.

Thermal overloads operate by connecting a heater in series with the motor. Thermal overloads can be divided into two types. The overload relay types include fixed bi metallic interchangeable heater bimetallic and electronic. I have already given details about thermal overload relay in past.

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. 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. 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.

Overload relay connection diagram.