Item No.: LYAP-A3

LYAP-A3 ADJUSTABLE V/A

Description：

Overvoltage protector, professional level voltage abnormality protection, automatic disconnection and restoration of power supply, ensuring safe and stable operation of equipment.
1. AC/DC universal (no overcurrent function available under DC power)
2. Password lock setting function (default 112, after setting the password to fee 112, the parameter range cannot be changed arbitrarily, and subsequent modifications will default to password 112 before parameters can be modified)
3. Manual knife switch function (When the product encounters overvoltage, undervoltage, overcurrent and power failure during use, it will not automatically restore power supply. The power must be manually opened and closed by pressing the power on/off button.)
4. Energy saving electricity consumption (After setting, the brightness of the digital display will decrease, thereby achieving the effect of energy-saving electricity consumption)
5. Quick power failure protection (accidental disconnection, power failure protection will be quickly carried out after disconnection)
6. The frequency usage range is wider, 40/50/60/70Hz
7. The product comes with current, voltage, and frequency correction (professional electricians can manually calibrate it, but it is not recommended for users to use this function)
8. The product's current accuracy can recognize 0.1A, and the action current can be set in 0.1A steps for adjustable currents above 1A.
9. It is possible to switch between wheel display modes, including voltage (U), current (A), frequency (H), and power (P).

This industrial-oriented over and under voltage protector is built for demanding electrical environments requiring continuous voltage supervision.

🔹 Key Technical Knowledge

Application focus: Industrial power systems
Protection function: Voltage abnormality cutoff
Installation: DIN rail
Design priority: Durability and stability

🔹 Why choose this product?

Suitable for harsh electrical environments
Long service life
Consistent protection under load

🔹 OEM & Manufacturing Advantage

As an experienced voltage protection device manufacturer, we provide industrial OEM solutions with stable long-term supply.

🔹 Use Cases / Industries

Grid-fluctuation-prone residential areas
Commercial lighting and general power circuits
Industrial control panels
Electrical contractor and service provider installations
Power conditioning and UPS accessory systems

Front-face Panel

Technical Data

Supply terminals

N,L

Rated supply voltage

AC220V；DC85-300V

Rated frequency

40/50/60/70Hz

>V setting range

AC130-300V;DC130-300V

<V setting range

AC80-210V;DC85-210V

Voltage hysteresis

Overvoltage trip delay

0.5s

Voltageaccuracy

<1%

Max.operating phase voltage

350V

Max.operating current

40A/63A

Altitude

≤2000m

Function

Lightning protection

Pemissable relative humidity

<50% at 25℃
（without condensation)

Ambient temperature

·-25℃~+55℃

Size

81*36*66mm

Setup Menu

Setcharacter

Technicalparameter

Setrange

Defaultvalue

P-1

Overvoltagesetting

240-300V

270V

P-2

Overvoltagedelaytime

1-300s

30s

P-3

Overvoltagesetting

140-210V

170V

P-4

Undervoltagedelaytime

1-300s

30s

P-5

OvercurrentSetting

1-63A

63A

P-6

Overcurrentdelaytime

1-300s

30s

P-7

Startingdelaytime

1-300s

FAQ

1. What is the Wide-Range Over & Under Voltage Protector with Status Display?
The Wide-Range Over & Under Voltage Protector is a robust protective device designed to protect electrical loads from both over-voltage and under-voltage conditions while providing a visual status display for real-time monitoring.

2. Why is a visual status display useful?
The front-panel status indicator allows technicians and end-users to instantly see protection status (normal, over-voltage, under-voltage, or reclosing), which improves fault diagnosis and reduces downtime.

3. How wide is the voltage range that this protector supports?
This model supports a broad input voltage range, making it suitable for regions with unstable grids or fluctuating supply conditions.

4. What installation method is used?
It installs on a DIN rail, universally compatible with standard power distribution cabinets and CT electrical panels.

5. Does it support automatic reconnection?
Yes. Once monitoring detects that voltage returns to within a safe operating range, the device automatically reconnects the load after a short delay.

6. Is OEM production and bulk supply available?
Yes. As a dedicated over and under voltage protector factory and supplier, we offer OEM customization, private-label packaging, and large-quantity supply for international partners.