Most errors occur here. Look at the top of the unit:
The Critical Rule: The Neutral must be continuous through the device. If you break the neutral, your electronic devices may still see a floating voltage. The TOVPD160EC usually switches the Live only, but monitors both.
Standard Wiring Pattern (Assuming typical model): | Terminal | Label | Connection | | :--- | :--- | :--- | | Left Top | L-In | Live from Grid/Main Breaker | | Right Top | N-In | Neutral from Grid | | Left Bottom | L-Out | Live to House Load | | Right Bottom | N-Out | Neutral to House Load |
Before we touch a screwdriver, let’s break down the name:
The Core Function: Unlike a standard circuit breaker (which trips on short circuits) or a Type 2 surge arrester (which catches lightning spikes), the TOVPD160EC monitors the continuous line voltage. If the grid goes too high (Over-voltage) or too low (Under-voltage), it disconnects your load instantly. When the grid stabilizes, it automatically reconnects.
Follow this improved step-by-step:
The TOMZN TOVPD1-60-EC is a DIN-rail mounted adjustable protector designed to shield single-phase electrical equipment from over-voltage, under-voltage, and over-current events. It features a dual-LED display for real-time monitoring and automatically restores power once the electrical circuit stabilizes. Key Technical Specifications Operating Voltage: 230V AC, 50/60Hz. Maximum Current: Adjustable up to 63A. Power Consumption: less than 2W. Response Time: adjustable from 0.1s to 30s. Setup and Programming (A1–A14) tomzn tovpd160ec manual better
To enter the setting mode, press and hold the SET button for 3 seconds. Use the UP and DOWN buttons to adjust values, and press SET again to cycle through parameters. Parameter Description A1 Power-on delay time A2 Over-voltage trip value 230V–300V (or OFF) A3 Over-voltage recovery value 225V–295V A4 Over-voltage recovery delay A5 Over-voltage action time 0.1s–30s A6 Under-voltage trip value 140V–210V (or OFF) A7 Under-voltage recovery value 145V–215V A8 Under-voltage recovery delay A9 Under-voltage action time 0.1s–30s A10 Over-current trip value A11 Over-current action time 0.1s–30s A12 Over-current recovery delay A13 Voltage calibration A14 Over-current limit times 1–20 times (or OFF) Special Functions
Factory Reset: Press and hold the DOWN button for more than 12 seconds.
Fault Inquiry: Press and hold the UP button for more than 12 seconds to view the last recorded fault reason (e.g., "Er1" for over-voltage).
Manual On/Off: The first button (often labeled with a power icon) can manually toggle the load. When off, the lower display will show "oFF".
For detailed visual walkthroughs, you can refer to the TOMZN TOVPD1-60-EC Parameter Setting Video or the TOVPD1-60-EC Settings Guide (PDF).
It’s a digital programmable time switch for DIN rails (standard in electrical panels). Key specs: Most errors occur here
The TOMZN TOVPD160EC is a robust piece of kit for any smart home or industrial automation setup. While the paper manual might be lacking, the interface is quite intuitive once you understand that you must press the Clock button to save your time settings and the Program button to cycle through schedules.
Disclaimer: This blog post is for informational purposes. Always consult a qualified electrician for installation work involving high voltage.
Enter Setup Mode: Press and hold the SET button for 3 seconds to enter configuration mode.
Adjust Values: Use the UP or DOWN keys to modify parameters. Holding these buttons allows for rapid value changes.
Save & Exit: Hold the SET button for 3 seconds to save changes. The device will also auto-save and exit if no buttons are pressed for 30 seconds.
Factory Reset: Press and hold the DOWN button for more than 12 seconds. The Critical Rule: The Neutral must be continuous
Fault History: Press and hold the UP button for more than 12 seconds to view fault inquiries. Key Protection Settings
The device comes with pre-programmed defaults, but these can be customized:
Note: No official Tomzn manual exists under that exact model code in public databases as of 2026. This guide assumes TOVPD160EC is a 160A two-pole or four-pole residual current circuit breaker with over/under voltage protection (common in Tomzn’s “TOVPD” series). Adjust based on the actual device label.
Tomzn isn’t a massive brand like Siemens or Schneider, so their manuals aren’t always on the first page of Google. Here is the better way to get the official PDF:
If you’re in a rush, the core settings are standard for most digital timers, so let me give you a better explanation than the original manual.