3/28/2023 0 Comments Principle of overload![]() When the motor activates then the flowing motor throughout the OLR will be there. The connection of this relay can be done with the motor in series so that the flow of current will be there towards the motor. Therefore, these relays are called current dependent as well as the inversely time-delayed relay. The time taken for tripping is always inversely proportional to the flow of current throughout the relay. Once the bimetallic strips get heat, then the contact trip can be activated and breaks the power supply toward the contactor coil, deactivates it & breaks the flow of current toward the motor. These relays always work with contractors. When the flow of current increases the fixed value then the bimetallic strip gets heated up then it bends. The arrangement of this in the motor circuit can be done like the flow of current to the motor can be done using its poles. The working principle of an overload relay depends on an electro-thermal property within a bimetallic strip. If anyone tries to push the start switch to shut the contactor switches, then the motor will not be switched on. ![]() For instance, when the overload relay explores within a bimetallic relay, then the NC (normally-closed) bimetallic connections will unlock the circuituntil the strip gets cool. One main security characteristic of this relay is that stops the motor from instantly restarting. Class 10, Class 20, and Class 30 overload relays can be explored later than 10 secs, 20 secs, and 30 secs correspondingly. The classes of overload relay can be classified into three types based on the duration of relay explore. Whenever the flow of current toward the motor is more than what the heaters are charged for, the overload explores later than some seconds. Whenever the strip is heated at a particular temperature, then the strip can twist far enough for breaking this circuit. ![]() The designing of this relay can be done by using two dissimilar kinds of metal strips, and these strips can be connected mutually as well as to enlarge at diverse rates while heated. Although there are several types of overload relays available in the market, however, the most frequent type of relay is the “bimetallic thermal overload relay”. ![]()
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