LY3I4-AC200/220

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Introduction

The LY3I4-AC200/220 is a common three-phase power relay that is used for power distribution, motor control, and other power-related applications. The nominal current rating is 200A/220A for both AC and DC and it has a maximum voltage rating of 660VAC/440VDC. It is a mechanically operated contactor with an electronic overload protection that works by indentifying current inrush when switching motor loads.

Application Fields

This three-phase power relay is designed to provide overload protection and power interruption for motor control systems, motor starters, transformers, and other induco motors. It is also used in heating and ventilation systems, air conditioning systems, and other applications that require precise current sensing and protection.

The contactor can be used in numerous applications, such as high-voltage electrical, power distribution, process control equipment, shipbuilding, HVAC systems, inrush protection, energy efficiency, and life cycle management. These contactors are also widely used in power factor controllers to improve energy efficiency and reduce energy consumption.

Working Principle

The LY3I4-AC200/220 has a single-phase, three-pole contactor structure that uses an internal mechanical coil bind to keep the current switching circuit in place. It activates an electronic overload protection device when the contactor is activated. The overload protection works by measuring the current inrush and then determines the current through the contactor.

Once the limit is exceeded, the contactor automatically reduces the current in order to avoid overloading and to protect the contactor from damage. It also prevents the motor from stalling and will shut down the motor should the phase detect overloaded. The contactor will reset itself once the overload is detected after the current inrush is over.

Conclusion

The LY3I4-AC200/220 is a three-phase power relay with an electronic overload protection system that provides precise current sensing and protection. It is widely used in many applications, such as industrial motor control, power distribution, process control equipment, HVAC systems, and inrush protection. The contactor uses an internal mechanical coil bind to keep the current switching circuit in place and an overload protection device to ensure the contactor does not overheat or be damaged.

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