1. Product Overview
The GEYA GPS8 series are advanced protective devices designed for household and industrial electrical systems. They provide comprehensive protection against overvoltage, undervoltage, and overcurrent conditions, ensuring the safety and longevity of your equipment. These devices feature true RMS measurement, digital display for voltage and current, and fault status indication via LED.


2. Setup and Installation
2.1 Mounting
The GPS8 series devices are designed for DIN rail mounting, conforming to EN/IEC 60715 standards. Ensure secure installation on a standard DIN rail within your electrical panel.
2.2 Wiring Diagram
Proper wiring is crucial for the safe and effective operation of the protector. Refer to the diagrams below for correct connection. Note the difference between upper incoming line (U) and lower incoming line (D) models.
NOTE: This product does not have an isolation function. Always disconnect the superior Miniature Circuit Breaker (MCB) during maintenance to ensure safety.
3. Operating Instructions
3.1 Panel Diagram and Indicators

The device features a digital display for real-time voltage (V) and current (A) readings. LEDs indicate the status of overvoltage (>U), undervoltage (<U), and overcurrent (>I). The power open/close indicator shows the device's operational status.
3.2 Button Functions
- M (Setting Key): Press and hold for 3 seconds to enter parameter settings. After modifying, press and hold for 3 seconds to save.
- Up Arrow (Increase Value): Used to increase the value when setting parameters.
- Down Arrow (Decrease Value / Manual On/Off): Used to reduce the value when setting parameters. After exiting settings, a short press can manually turn on or off the load. If the automatic fault reset function is off, this button can be used for manual reset after a fault.
3.3 Parameter Setting
To adjust parameters:
- Press and hold the 'M' button for 3 seconds to enter the setting mode.
- Use the Up and Down arrow buttons to navigate through parameters and adjust values.
- Press and hold the 'M' button again for 3 seconds to save the changes and exit.
- If no button is pressed for 60 seconds in setting mode, the device will automatically exit without saving.
Key adjustable parameters include:
| Parameter | Range | Step Value | Factory Default |
|---|---|---|---|
| Over voltage value | OFF, 230V~300V | 1V | 275V |
| Over voltage recovery value | 225V~295V | 1V | 265V |
| Under voltage value | 140V~210V, OFF | 1V | 175V |
| Under voltage recovery value | 145V~215V | 1V | 180V |
| Voltage fault action time | 0.1s~10s | 0.1s | 0.5s |
| Over current value (GPS8-02/03 only) | OFF, 1A~80A | 0.1A | 32A/40A/50A/63A/80A (depending on model) |
| Over current action delay (GPS8-02/03 only) | 2s~600s | 1s | 5s |
| Power-up delay | 2s~600s | 1s | 5s |
| Reset time | 2s~900s | 1s | 30s |
| Fault reset | ON-OFF | - | ON |
3.4 Power-up and Reset Delay
During power-up and after a fault reset, the device will count down and display the remaining time according to the set delay parameters. Once the countdown finishes, the device will enter its normal running state.

4. Maintenance and Safety
4.1 General Maintenance
Regularly inspect the device for any visible damage or loose connections. Ensure the operating environment is within the specified temperature and humidity ranges.
4.2 Safety Precautions
- Installation and maintenance must be performed by qualified electricians.
- All electrical connections must comply with appropriate safety standards.
- This product does not have an isolation function. Always disconnect the main circuit breaker (MCB) upstream of the protector before performing any maintenance or inspection.
4.3 Disposal of Electrical Waste
All electrical waste should be disposed of in compliance with current WEEE (Waste Electrical and Electronic Equipment) regulations. Do not dispose of with general household waste.
5. Troubleshooting
- Device not powering on: Check the rated supply voltage and ensure it matches the device's requirements (AC220V L-N). Verify all connections are secure.
- Incorrect voltage/current readings: Ensure proper wiring and that the device is correctly configured for your system. The device uses true RMS measurement.
- Frequent tripping: Review your parameter settings for overvoltage, undervoltage, and overcurrent. Adjust the operation values and action delays as needed to match your load characteristics.
- Device not resetting after fault: Check if the 'Fault reset' parameter is set to 'ON'. If set to 'OFF', manual reset via the Down Arrow button is required.
- Noisy or humming operation: The device is designed for quiet operation. If you experience noise, check for loose connections or consult support.
- Compatibility with 120V systems: This device is designed for 220V AC (L-N) systems and is not compatible with 120V.
- Outdoor use in winter: The operating temperature range is -20°C to +60°C. Ensure the ambient temperature remains within this range for reliable operation.
- Compatibility with inverter motors: The device uses a relay for operation, which generally works well with inverter-driven electrical motors.
- Settings not saved after power loss: The device is designed to retain settings. If settings are lost, contact support.
6. Specifications
| Parameter | Specification (GPS8-02) |
|---|---|
| Function | Over voltage, under voltage and over current protection |
| Rated supply voltage | AC220V (L-N) |
| Rated supply frequency | 45~65Hz |
| Operation voltage range | 80V~400V (L-N) |
| Rated operational current | 32A, 40A, 50A, 63A, 80A (AC1) |
| Burden | AC max. 3VA |
| Over voltage operation value | OFF, 230V~300V |
| Under voltage operation value | 140V~210V, OFF |
| Over/under voltage action delay | 0.1s~10s |
| Over current operation value | 1~32A, 40A, 50A, 63A, 80A |
| Over current action delay | 2s~600s |
| Power-up delay | 2s~600s |
| Reset time | 2s~900s |
| Measurement error | <1% |
| Electrical life (AC1) | 1×104 |
| Mechanical life | 1×106 |
| Operating temperature | -20°C~+60°C |
| Storage temperature | -35°C~+75°C |
| Mounting/DIN rail | Din rail EN/IEC 60715 |
| Protection degree | IP40 for front panel/IP20 terminals |
| Operating position | Any |
| Overvoltage category | III. |
| Pollution degree | 2 |
| Dimensions | 82×36×68mm |
| Weight | 135g |
6.1 Dimensions (mm)

7. User Tips
- Adjustability: The current cut-off, over/undervoltage, and delay times are fully adjustable, allowing customization for various applications.
- Automatic Operation: The device features automatic turn-off and turn-on in response to faults, providing continuous protection.
- Power-on Delay: A built-in timer delays switching on after power restoration or a fault, allowing the system to stabilize.
- Quiet Operation: The device operates silently, without humming or noise during normal function.
- Settings Retention: Settings are saved even after a long absence of power, ensuring consistent protection.
- Fast Response: The relay reaction time to events is approximately half a second, providing quick protection.
8. Warranty and Support
GEYA products are certified to required industry standards, including CE and RoHS, ensuring quality and compliance. For detailed guides and further information, please refer to the official user manual PDF available at GEYA GPS8 User Manual (PDF).
For technical support or inquiries, you may contact GEYA Electrical Co., Ltd. directly:
- Email: sale@cngeya.com
- Website: www.geya.net
- Mobile: 0086-13567770207

9. Company Introduction Video
Learn more about GEYA Electrical Co., Ltd., their manufacturing processes, and commitment to quality through this introductory video.





