Adjustable Over and Under Voltage Protector

If the voltage fluctuation will not only lead to equipment performance degradation, more likely to cause component damage, data loss and even fire hazards.Pugao( PLANNTER) Adjustable Over and Under Voltage Protector can not only be the first time to identify abnormalities, cut off the power supply, real-time monitoring, over-voltage and under-voltage fast power off, to extend the life of the equipment, but also support OEM/ODM, applicable to home, office, medical and industrial control systems. It also provides maintenance personnel with intuitive voltage change data, which facilitates long-term operation monitoring before a fault occurs.

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Product Description

Pugao( PLANNTER) has its own factory and all products of the company have passed national and international laboratory type tests. The company has certificates of ISO9001, ISO14001, ISO45001, IEC standard type test report and so on.The Adjustable Over and Under Voltage Protector is small in size, does not occupy space, easy to install, using rail mounting, without additional auxiliary power. And high safety factor can be real-time monitoring of single-phase over-voltage, under-voltage fault conditions. Whether over-voltage or under-voltage, the value is adjustable, 3 indicator lights to indicate various working status operation is simple.

What Is an Adjustable Over and Under Voltage Protector?

The Adjustable Over and Under Voltage Protector is a compact safety device designed to monitor voltage fluctuations in real time and automatically disconnect power when abnormal conditions occur. It helps prevent equipment damage, data loss, and safety hazards caused by unstable voltage.

Real-time monitoring of voltage conditions
Automatic power cut-off during faults
Suitable for home, office, medical, and industrial systems

Key Features

Adjustable Thresholds

Voltage settings adjustable within 220V–230V range for single-phase systems
Dual digital display shows real-time voltage and set values
Allows precise customization based on application requirements

Protection Types

Overvoltage protection (e.g., >230V)
Undervoltage protection (e.g., <230V)
Overcurrent protection (e.g., >63A)
Automatic disconnection to prevent equipment damage
The Adjustable Over and Under Voltage Protector ensures safe operation under unstable power conditions

Recovery Times

Automatic recovery after voltage returns to normal range
Adjustable delay time to prevent frequent switching
Improves system stability and equipment lifespan

Installation

Compact size with DIN rail mounting design
No additional auxiliary power required
Quick and easy installation in distribution panels

Versatility

Applicable to residential, commercial, and industrial environments
Provides visual status via red/green LED indicators
Supports OEM/ODM customization for different project needs
The Adjustable Over and Under Voltage Protector offers a flexible solution for modern power protection systems

Adjustable Over and Under Voltage Protector

Key Differences

Voltage Protector vs. Surge Protector

Function: A voltage protector monitors continuous voltage levels, while a surge protector handles short, high-energy spikes (transients)
Protection Scope: Voltage protectors cut off power during over/under voltage; surge protectors absorb or divert sudden spikes
Response Time: Surge protectors react in nanoseconds to spikes; voltage protectors respond to sustained abnormal voltage conditions
Application: Surge protectors are ideal for lightning or switching surges, while the Adjustable Over and Under Voltage Protector is designed for long-duration voltage instability
System Safety: Using both devices together provides more complete protection

Voltage Protector vs. Stabilizer

Function: A voltage protector disconnects power when voltage is unsafe; a stabilizer actively regulates and maintains a steady output voltage
Operation Mode: Protectors act as a safety cutoff device, while stabilizers continuously adjust voltage levels
Cost & Complexity: Voltage protectors are simpler and more cost-effective; stabilizers are more complex and typically more expensive
Energy Use: Stabilizers consume power during operation; protectors like the Adjustable Over and Under Voltage Protector have minimal energy consumption
Use Case: Protectors are suitable for general equipment safety, while stabilizers are used where constant voltage is required

FAQ

Can I customize the voltage thresholds for a single-phase 230V system?

Yes, of course. We support adjustable voltage settings from 220V to 230V. This Adjustable Over and Under Voltage Protector features a dual digital display that shows the adjustment value in real time, and red and green LEDs that warn of over/under voltage conditions as a precautionary measure.

What protection against power fluctuations does the dual-display voltage protector offer?

The device prevents damage from overvoltage >230V, undervoltage <230V, overcurrent >63A and undercurrent <63A. The red/green LEDs clearly show abnormal conditions, so don't worry, the cut-off function will be automatically activated to prevent damage to the device if the voltage fluctuates too much.

How Do I Install an Adjustable Voltage Protector?

Mount the device on a standard DIN rail inside the distribution panel
Connect the input (power supply) and output (load) terminals according to the wiring diagram
Ensure wiring matches rated voltage (e.g., 220–230V single-phase)
Set over/under voltage thresholds before operation
The Adjustable Over and Under Voltage Protector does not require additional auxiliary power, simplifying installation

Why Does the Device Turn Off and Then Back On?

This is normal protective behavior during voltage fluctuations
The device cuts off power when voltage exceeds or drops below set limits
It automatically reconnects after voltage returns to a safe range
Built-in delay (recovery time) prevents frequent switching and protects equipment
The Adjustable Over and Under Voltage Protector ensures continuous protection without manual reset

What Do I Do If the Screen Displays Voltage but No Power to the House?

Check if the device is in protection mode due to abnormal voltage
Verify that voltage is within the preset safe range
Wait for the delay time to expire for automatic reconnection
Inspect wiring connections for loose or incorrect installation
If the issue persists, consult a qualified electrician or technical support

Display and Buttons

Adjustable Over and Under Voltage Protector

1 - SET Button:This button is used to save after setting/changing Over-current values & high/low voltage setting values and error

wait time.

2 - UP Button: Increase the required value.

3 - Down Button: Reduce the required value.

Adjustable Over and Under Voltage Protector

4 - Manual On/Off Button: Used to manually control the device output. When the button is pressed to turn off the output, the screen will show “OFF”, and the device will not perform automatic reset functions. Press the button again to turn the device back ON and resume normal operation (under non-fault conditions).

5 - Current Display

1st Display Group: During normal operation, this Adjustable Over and Under Voltage Protector display shows the input (mains) voltage value. The screen remains steadily lit under normal conditions and flashes when an error occurs (such as high or low voltage). During parameter programming, this display shows the corresponding setting values, including overcurrent, high/low voltage limits, error delay time, and reset delay time.

Adjustable Over and Under Voltage Protector

6 - Voltage Display

2nd Display Group: During normal operation, this display shows the current value. The screen remains steadily illuminated under normal conditions and flashes when an over-current fault occurs. During parameter programming, this display indicates the corresponding numerical values of the relevant settings.

7 - LED Indicators:

A>: Illuminates when an over-current fault is detected.

V>: Illuminates when a high-voltage fault is detected.

V<: Illuminates when a low-voltage fault is detected.

OUT: Lights up when the device begins to output power.

Connection Diagram:

The neutral and phase wires from the mains supply must be connected to the “N” and “L” terminals labeled “Input” on the device.

The neutral and phase connections for the equipment to be protected from over- and under-voltage should be taken from the “N” and “L” terminals in the “Output” section of the device.

Adjustable Over and Under Voltage Protector

Dimensions

Adjustable Over and Under Voltage Protector

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Contact Info

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Address

Qiligang Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China
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Tel

+86-18072106366
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E-mail

kevin@pugaoai.com

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