PL59CH

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The PL59CH is an industrial type electromechanical starter which applies to medium and large three-phase asynchronous motors with a rated voltage of up to 440V. With the load disconnect device, it is possible to realize the overload protection, short-circuit protection, undervoltage protection and three-phase-failure protection of the motor.

The PL59CH starter is composed of mainly three main parts: contactors, overload relays and button boxes. The contactors are the main switch of the starter, responsible for turning on and off the motor. They are composed of relay coils, contact-making parts and contact-breaking parts which are driven by the coil separately.

The overload relays are designed to protect the motor from overloads and short circuits. In the case of overload and short circuits, the overload relay will act together with the contactor and trip off the motor circuit to ensure the electrical safety of the motor. These relays have both adjustable and fixed versions.

Finally, the button boxes are used to control and indicate the motor\'s operation. The buttons and indicators are usually integrated in a single device. They are used for starting and stopping the motor, displaying the running status, switching on and off the overload protection devices and releasing a trip.

The working principle of the PL59CH starter is relatively simple. When the start button is pressed, the contactor is energized and the motor is turned on. When the overload protection device senses a current exceeding the rated value, the contactors will be tripped off and the motor will be shut down. The contactors can also be manually tripped off by pressing the “Off” button.

In conclusion, the PL59CH starter is an industrial type electromechanical starter with a great performance when it comes to controlling and protecting the motor from overloads and short circuits. It is composed mainly of contactors, overload relays and button boxes and the working principle is relatively straightforward. It is widely applied to medium and large three-phase asynchronous motors with a rated voltage of up to 440V.

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