This relay is connected among motor as well as main contactor.The T1, T2, and T3 are connected to the relay.The connection of thermal overload relay can be done by using the following steps. The three NO contacts are used to connect the induction motor to supply lines whereas the auxiliary contact is used to boost the contactor coil when the start button is opened. For instance, a 4-pole type contactor consists of three normally open contacts and one is auxiliary or holds on contact. Generally, the contactors are 3-poles contactors or 4-pole contactors. The motor can be started when we shut the contact by pressing the green switch, and the full-line voltage comes out to the induction motor. The two switches of the motor control the contacts. The DOL starter comprises a circuit breaker (or) MCCB, overload relay & contactor for protecting the motor. The DOL starter consists of two switches namely Green and Red where the green switch is used to start and red switch is used to stop the motor. The Direct Online Starter consists of a protective device as well as main contacts. The attractiveness of this kind of starter is, it can be connected straightly to the motor, and it doesn’t affect the induction motor. This starter joints three phase motors straight across the supply of three phases. The most fundamental, economical, as well as an easy method for running a three-phase induction motor is named as the DOL starter.
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