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Contactors (Electromechanical)

A contactor is an electrically-controlled mechanical device that uses an electric current to open and close one or more circuits. The PBC-050A3M contactor is a 3-phase, 50A-rated contactor and is available in a variety of frames and coil voltages to meet the requirements of any application.

PBC-050A3M Application Field

The PBC-050A3M contactor is suited for various types of applications, including controlling motors in industrial and commercial equipment, such as type of production processes, HVAC systems, conveyors and other motor/appliance loads. Additionally, it can be used in motor control centers and power distribution systems.

PBC-050A3M Working Principle

The PBC-050A3M contactor is an overload-relay controlled contactor with a 3-pole design. In operation, when electrically triggered, the contactor will close the circuit, allowing the current to pass through it. It is responsible for opening and closing the circuit at a certain amount of current, as set by the user, to protect the motor from an excessive inrush of current.

The contactor comprises three sets of contacts. The main contact is connected to the input power supply. The control contact is connected to the overload relay, which determines the amount of current allowed to pass through the main contact. The auxiliary contact is used for other functions, such as connecting a pilot light for monitoring the contactor\'s status.

When the overload relay senses that the current has surpassed the predefined threshold, it will trip the contactor, disconnecting the power supply and cutting off the power to protect the motor from further damage. The contactor will remain tripped until an operator resets the overload relay.

Conclusion

The PBC-050A3M contactor is a 3-phase, 50A-rated contactor suitable for a wide range of applications. It is an overload-relay controlled contactor with a 3-pole design and is capable of breaking and opening circuits, depending on the user-defined current threshold.

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