1. Safety Information
⚠ Warning
To avoid danger of suffocation, keep any plastic packaging away from babies and children. Do not use this packaging in cribs, beds, carriages, or playpens. This packaging is not a toy.
This device is designed to protect electrical equipment from voltage and current fluctuations. Please read and understand all instructions before use.
General Precautions:
- Installation should be performed by a qualified electrical professional.
- Connect the equipment strictly according to wiring diagram specifications.
- Adjust parameters as per instructions for optimal protection.
- Do not place the device near flammable materials.
- Ensure adequate ventilation during operation.
- Disconnect from power and store properly when not in use for extended periods.

2. Product Overview
The TOMZN TOSVA-16 is a versatile voltage and current protector designed to safeguard your electrical appliances from damaging power fluctuations. It features a digital display for real-time monitoring and adjustable protection parameters.
Key Features:
- Over-voltage Protection: Automatically disconnects power when voltage exceeds a set limit.
- Under-voltage Protection: Automatically disconnects power when voltage drops below a set limit.
- Over-current Protection: Disconnects power if the current drawn by the appliance exceeds the adjustable limit.
- Automatic Recovery: Restores power once voltage and current return to safe levels after a set delay.
- Digital Display: Shows real-time voltage and current measurements.
- Adjustable Parameters: Allows customization of protection values, recovery delays, and calibration.
- Flame-Retardant Housing: Constructed from PC flame-retardant material for enhanced safety.
- High Conductivity: Features nickel-plated copper plates for efficient power transfer and low heat generation.
- Fast Response: Safety socket responds within 0.1 seconds in case of danger.

Applications:
The TOSVA-16 is suitable for a wide range of AC indoor electrical equipment and home appliances, including:
- Air-conditioning units
- Water heaters
- Microwave ovens
- Washing machines
- Televisions
- Humidifiers
- Electric fans
- Electric heaters
- Refrigerators

3. Specifications
| Function | Technical Parameter | Function | Technical Parameter |
|---|---|---|---|
| Model Number | TOSVA-16 | Power-on delay time | 1-500s (default 10s) |
| Power Supply | 90-300VAC 50/60Hz | Over-voltage protection value | 100-300V (default 270V) |
| Max. Loading Power | 1-16A Adjustable (default: 16A) | Over-voltage recovery value | 95-295V (default 265V) |
| Under-voltage protection value | 80-210V (default 170V) | Over-current protection value | 1-16A (default 16A) |
| Under-voltage recovery value | 85-215V (default 175V) | Over-current recovery value | 0.5-15.5A |
| Recovery delay time | 1-500s (default 30s) | Action time | 0.1-30s (default 1s) |
| Continuous over current faults times | 1-20 times (default OFF) | Electrical and mechanical life | ≥100000 cycles |
| Power consumption | ≤2W | Socket type | Universal, UK, EU, US, Thailand |

Dimensions:
- Width: 45mm
- Height: 122mm
- Depth (excluding plug pins): Approximately 72mm (varies slightly by plug type)



4. Setup and Configuration
Before initial use, it is recommended to have a qualified electrical professional perform the installation and initial setup.
Initial Connection:
- Plug the TOSVA-16 into a suitable wall socket.
- Connect your appliance to the socket on the TOSVA-16.
- The device will display voltage and current readings.
Parameter Adjustment:
To enter the settings menu, press and hold the SET button for more than 3 seconds. Use the Up (▲) and Down (▼) buttons to navigate and adjust values. Press SET again to confirm a value and move to the next parameter, or to exit the settings menu.

The following parameters can be adjusted:
- A1: Power-on delay time (1-500s): Time before power is supplied after connection or recovery.
- A2: Over-voltage protection value (100-300V-OFF): Upper voltage limit.
- A3: Over-voltage recovery value (95-295V): Voltage at which power is restored after over-voltage.
- A4: Over-voltage recovery delay time (1-500s): Delay before power is restored after over-voltage.
- A5: Over-voltage protection action time (0.1-30s): How quickly the device reacts to over-voltage.
- A6: Under-voltage protection value (OFF-80-210V): Lower voltage limit.
- A7: Under-voltage recovery value (85-215V): Voltage at which power is restored after under-voltage.
- A8: Under-voltage recovery delay time (1-500s): Delay before power is restored after under-voltage.
- A9: Under-voltage protection action time (0.1-30s): How quickly the device reacts to under-voltage.
- A10: Over-current protection value (1-16A): Upper current limit.
- A11: Over-current recovery delay time (1-500s): Delay before power is restored after over-current.
- A12: Over-current protection action time (0.1-30s): How quickly the device reacts to over-current.
- A13: Voltage calibration (-9.5% to +9.5%): Adjusts the displayed voltage for accuracy.
- A14: Continuous over current faults times (OFF-1-20): Number of over-current events before permanent lockout (requires manual reset).
- A15: Current calibration (-9.5% to +9.5%): Adjusts the displayed current for accuracy.
Factory Reset:
To restore the device to its factory default settings, press and hold the Down (▼) button for more than 12 seconds.
5. Operating Instructions
Once configured, the TOSVA-16 operates automatically to protect your connected appliances.
Monitoring:
The LED display continuously shows the current voltage (top display) and current (bottom display) of the connected circuit. A green "POWER" indicator light confirms the device is supplying power.

Protection Activation:
If the voltage or current goes outside the set safe parameters, the device will automatically cut off power to the connected appliance to prevent damage. The display will indicate the fault condition (e.g., ">V" for over-voltage, "
Automatic Recovery:
After the fault condition clears and the set recovery delay time has passed, the device will automatically restore power to the appliance.
Manual Switch:
You can manually turn off the protection function by pressing the power button (Ⓞ) on the device. Press it again to re-enable protection.
6. Maintenance and Troubleshooting
Maintenance:
- Keep the device clean and free from dust. Wipe with a dry, soft cloth.
- Avoid exposing the device to moisture or extreme temperatures.
- Regularly check for any signs of physical damage.
Troubleshooting:
- Device not powering on: Ensure it is securely plugged into a live wall socket.
- Frequent protection trips:
- Check the voltage and current readings on the display.
- Verify that the connected appliance's power requirements are within the device's limits and your set parameters.
- Adjust the over-voltage, under-voltage, or over-current protection values if they are too sensitive for your environment.
- Consider if there are frequent power fluctuations in your area.
- Fault Inquiry: To check for past fault events, press and hold the Up (▲) button for more than 12 seconds.
- Device unresponsive: Perform a factory reset by pressing and holding the Down (▼) button for more than 12 seconds.
7. User Tips
- This device is highly recommended for households in areas prone to voltage fluctuations to protect sensitive electronics and appliances like refrigerators.
- The TOSVA-16 can work effectively with other input relays from the same manufacturer.
- If you are unsure about the correct voltage settings for your region, consult a local electrician or refer to your appliance manuals.
- The device has a low power consumption of approximately 1 watt.
- For visual guidance on setup and configuration, search for "TOMZN TOSVA-16 setup" online.
- Remember to recalibrate the device to your specific local voltages if needed, especially after moving to a different region.
8. Certifications and Compliance
The TOMZN TOSVA-16 Voltage Protector complies with the following European Directives:
- CE Certification: Indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA).
- Low Voltage Directive (LVD) 2014/35/EU: Ensures electrical equipment operating within certain voltage limits provides a high level of protection for European citizens.
- Electromagnetic Compatibility (EMC) Directive 2014/30/EU: Ensures that electrical and electronic equipment does not generate electromagnetic disturbances exceeding a level allowing radio and telecommunication equipment and other apparatus to operate as intended.
- Restriction of Hazardous Substances (RoHS) Directive 2011/65/EU: Restricts the use of specific hazardous materials found in electrical and electronic products.

For a detailed user manual in PDF format, please refer to the official document: TOMZN TOSVA-16 User Manual (PDF)
9. Product Demonstration Video
This video demonstrates the physical appearance and basic functionality of the TOMZN TOSVA-16 Voltage Protector.