Important Safety Instructions
WARNING
⚠ This product does not feature an explosion-proof structure and must not be used in flammable environments, such as those containing flammable gases, liquids, or explosives.
SAFETY INFORMATION
- Please use this product in accordance with the instructions in this manual.
- Do not disassemble this product by yourself.
- Pay attention to the rated voltage for use.
Product Description
The EARU Digital Programmable Din Rail Time Switch Relay Timer is a switching component that uses electronic technology to achieve automatic circuit control. Its core function is to control the on/off switching of high currents using low currents, serving purposes such as isolation, amplification, and automatic switching. It features advanced pre-setting for up to one week, daily and weekly programs, and up to 18 ON/OFF settings. The device also includes a lithium battery for power reserve during power outages and automatic time error correction.
Package Contents
Upon opening the package, please ensure all the following items are present and in good condition:
- 1 x Digital Timer
- 1 x English Instruction Manual
Specifications
The following table details the technical specifications of the EARU Digital Programmable Din Rail Time Switch:
| Feature | Specification |
|---|---|
| Model Numbers | THC15A, THC30A (also AHC15A, AHC30) |
| Voltage Rating | AC220V (Voltage LIMIT: AC180~240V) |
| Available Voltages | 12V, 24V, 48V, 110V, 220V, 230V |
| EU LVD Voltage | High voltage: Above 50Vac or 75Vdc |
| Hysteresis | ≤2 sec/day (at 25°C) |
| ON/OFF Operation | 18 ON & 18 OFF settings |
| Power Consumption | 7.5VA (max) |
| Service Life (Mechanical) | 107 operations |
| Service Life (Electrical) | 105 operations |
| Minimum Interval | 1 minute |
| Countdown Function | 1 second - 99 minutes 59 seconds |
| Pulse Function | 1 second - 59 minutes 59 seconds |
| Load Capacity (Resistive) | 30A / 250VAC |
| Load Capacity (Lagging) | 25A / 250V |
| Load Capacity (Lamp) | 4.5KW |
| Switching Contact | 1 changeover switch (SPDT) |
| Power Reserve | 3 years (lithium battery) |
| Ambient Temperature | -10°C to +40°C |
| Ambient Humidity | 35% to 85% RH |
| Weight | Approx. 150g |
| Certification | CE |
| Mounting Type | DIN Rail Installation |
Setup and Installation
The EARU Digital Time Switch is designed for DIN rail installation. Ensure the power supply is disconnected before proceeding with any wiring.
DIN Rail Mounting
The device can be easily mounted onto a standard DIN rail. Align the clips on the back of the timer with the DIN rail and press firmly until it clicks into place.
Wiring Diagrams
Refer to the following diagrams for correct wiring. Always ensure the power is off before making any connections.
1NO (Normally Open) Configuration
1NO1NC (Normally Open/Normally Closed) Configuration
Operating Instructions
This section guides you through the initial setup and programming of your EARU Digital Time Switch.
Initial Setup
- Reset: For first-time use, press the RESET key using a pointed object (e.g., a pen tip) to clear any previous settings.
- Time Mode: The time switch defaults to 24-hour mode. To switch to 12-hour mode, press and hold the MANUAL key for 5 seconds. The LCD will display "AM". To revert to 24-hour mode, press and hold the MANUAL key again for 5 seconds.
Programming ON/OFF Times
The device allows for up to 18 ON/OFF settings. Follow these steps to program your desired schedule:
| Action | Description |
|---|---|
| Press P | Enter setting mode for ON time (display shows "1 on") |
| Press H+ / M+ | Set desired hours and minutes for the ON time |
| Press D+ | Select days of the week for this ON setting. Options include:
|
| Press P | Enter setting mode for OFF time (display shows "1 off") |
| Press H+ / M+ | Set desired hours and minutes for the OFF time |
| Press D+ | If the OFF setting applies to the same days as the ON setting, you do not need to press this key. |
| Repeat steps 2-6 | Set additional ON/OFF times (up to 18 total) |
| Press MANUAL | Exit programming mode and save settings. If you do not need all 18 settings, press this key to end. |
The timer also features a 30-second control bell function for programmed events.
Manual ON/OFF Control
The MANUAL button can be used to override programmed settings for immediate ON/OFF control. Pressing it cycles through ON, OFF, and AUTO modes.
Video Tutorial
Watch this video for a visual guide on setting up and operating your time switch:
Maintenance
- Keep the device clean and free from dust and moisture.
- Do not expose the device to extreme temperatures or direct sunlight.
- Avoid using harsh chemicals or abrasive cleaners on the device.
- The internal lithium battery provides power reserve for up to 3 years. If the display is blank or settings are lost frequently, the battery may need replacement (professional service recommended).
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on / Display is blank | No power supply; Internal battery depleted. | Check power connections. If power is present, the internal lithium battery might be depleted; consider professional service for battery replacement. |
| Programmed events not activating | Incorrect programming; Device in manual ON/OFF mode; Wiring issue. | Review programming steps carefully (Figure 8). Ensure the device is in AUTO mode (check display). Verify wiring connections (Figures 5, 6, 7). |
| Time display is incorrect | Time not set correctly; Hysteresis. | Reset the device and set the current time. The device has an auto time error correction of ±30 seconds weekly. |
| Relay does not switch load (as reported in Q&A) | Wiring error; Overload; Internal fault. | Double-check all wiring according to the diagrams. Ensure the connected load does not exceed the specified load capacity (30A resistive, 25A lagging, 4.5KW lamp load). If the issue persists, contact support. |
User Tips
- When setting the time or programming, use a small, non-conductive tool (like a pen tip) to press the recessed buttons to avoid accidental presses.
- If you experience issues with the relay not switching, first try a full reset of the device and re-program your settings. This can often resolve minor glitches.
- For applications requiring precise timing, be aware of the ±30 seconds weekly hysteresis and adjust programming if necessary for critical operations.
Warranty and Support
For any issues not covered in this manual, or for warranty claims, please contact your retailer or the manufacturer directly. Do not attempt to repair the device yourself, as this may void your warranty and pose safety risks.
Additional Resources
A comprehensive user manual in PDF format is available for download:
