VL-7709B

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VL-7709B application field and working principle

The VL-7709B is used to monitor protective device for each phase of the stream/cable. The unit has two terminals, load current and neutral current monitoring terminals. The control unit senses the flow of current in each of the conductors and will indicator a protective alarm if any of the phases reaches the preset limit.

Applications

The VL-7709B is widely used in the monitoring of three-phase protection systems. It is suitable for use in lighting control systems, elevators, AC contactors, motors, pumps, industrial equipment, and portable measuring systems.

Working Principle

The two terminals of the VL-7709B are connect between the phase lines and neutral line. The load current terminal measures the current flowing in the phase lines. The neutral current terminal measures the current flowing in the neutral line. When the current flowing in the phase lines reaches the set threshold, an alarm will be triggered. The alarm can also be triggered by an overload or short circuit on the phase lines.

Features

The VL-7709B features adjustable protective thresholds, a Modbus data output interface, a configurable protective relay output, and a digital display. The unit can be powered by AC or DC, and it has a built-in battery back-up for uninterrupted monitoring.

Conclusion

The VL-7709B is a highly reliable and cost-effective protective device for three-phase protection systems. It has a wide range of applications in industrial and commercial environments.

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