1. Introduction
The MARSTEK Automatic Transfer Switch (ATS) is designed to provide seamless power switching between multiple sources, ensuring continuous power supply to your electrical devices. This device intelligently monitors the voltage of connected power sources—utility power, generator, and inverter—and automatically transfers the load when the primary source fails or its voltage deviates from the set parameters. It incorporates advanced protection features to safeguard your electrical system.
Figure 1: Front view of the Automatic Transfer Switch, showing digital displays for voltage and current, and control buttons.
Figure 2: Product Introduction diagram detailing display indicators (L-in, L-out, Current), button functions (Menu, Digit+, Digit-, Manual ON/OFF), and basic operational specifications.
2. Product Features
- Automatic Power Switching: Seamlessly switches between utility power, generator, and inverter based on predefined voltage thresholds and availability.
- Three-Way Input: Supports simultaneous connection and prioritization of three distinct power sources.
- Flexible Settings: Adjustable parameters for transfer time (1-600s), reclosing delay time (1-600s), overvoltage protection (110-300V), undervoltage protection (80-220V), and overcurrent protection (1-80A).
- Multiple Protection Mechanisms: Integrated protection against undervoltage, overvoltage, and overcurrent to ensure the safety of connected electrical devices.
- LED Display: Five LCD screens provide real-time voltage readings for each input source, as well as the voltage and current of the currently active output, facilitating easy monitoring.
Figure 3: Visual representation of key product features, including Undervoltage Protection, Overcurrent Protection, and Overvoltage Protection.
3. Specifications
| Parameter | Value |
|---|---|
| Brand | MARSTEK |
| Model | LGX3-1 63A CE |
| Rated Operating Current | 63 Amps |
| Max. Operating Current | 80 Amps |
| Operating Voltage | 120 Volts |
| Rated Frequency | 50/60Hz |
| Operation Mode | ON-OFF |
| Contact Type | Normally Open |
| Connector Type | Plug In |
| Terminal Type | Screw |
| Circuit Type | 3-way |
| Contact Material | Silver |
| Product Dimensions (L x W x H) | 3.8 x 3.5 x 2.6 inches |
| Weight | 14.39 ounces |
| Ambient Temperature Range | -25°C to +50°C |
| Storage Temperature Range | -25°C to +55°C |
| Permissible Relative Humidity | ≤50% at 40°C (Without Condensation) |
Figure 4: Detailed product dimensions for installation planning.
4. Setup and Installation
Important: Installation should only be performed by a qualified electrician to ensure safety and compliance with local electrical codes. Disconnect all power sources before installation.
4.1 Mounting
The Automatic Transfer Switch is designed for rail mounting. Ensure a secure and stable mounting location within an appropriate electrical enclosure.
Figure 5: Illustration of the Automatic Transfer Switch mounted on a DIN rail.
4.2 Wiring Diagram
Connect your power sources (Public/Utility, Inverter, Generator) to the corresponding input terminals and your load to the output terminals. Ensure correct polarity (Neutral 'N' and Live 'L') for all connections.
Figure 6: Simplified wiring diagram showing connections for Public power, Inverter, and Generator inputs to the ATS, and the output to the load.
Figure 7: Detailed wiring diagram illustrating Neutral (N) and Live (L) connections for inputs and outputs of the Automatic Transfer Switch.
- Identify the Neutral (N) and Live (L) terminals for each power source (Public, Inverter, Generator) and the output.
- Connect the Neutral wire from each power source to its respective 'N' input terminal on the ATS.
- Connect the Live wire from each power source to its respective 'L' input terminal on the ATS.
- Connect the Neutral wire of your load to the 'N' output terminal.
- Connect the Live wire of your load to the 'L' output terminal.
- Ensure all connections are tight and secure.
5. Operating Instructions
5.1 Initial Power-Up
Once wired correctly, apply power to the connected sources. The ATS will display real-time voltage readings for each input and the current output status on its LCD screens.
5.2 Understanding the Display and Buttons
- L-in V: Displays the voltage of the respective input power source (Public, Inverter, Generator).
- L-out V: Displays the voltage of the currently active output.
- I-out A: Displays the current draw of the load.
- L1, L2, L3 Indicators: Indicate which input source is currently active.
- Fault Indicator: Illuminates if a fault condition is detected.
- M (Menu/Reset): Used to enter the settings menu and confirm selections, or to reset certain parameters.
- ▲ (Digit+): Used to increase values or navigate up in the menu.
- ▼ (Digit-): Used to decrease values or navigate down in the menu.
- ⏻ (Manual ON/OFF): Used for manual switching or to turn the device on/off.
5.3 Adjustable Parameters
The ATS allows for customization of various operational parameters to suit specific power management needs. To access and adjust these settings, refer to the detailed instructions in the full manual (not provided here, but implied by the image).
Figure 8: Table outlining adjustable parameters, their ranges, and default values for the Automatic Transfer Switch.
| Parameter | Range | Default |
|---|---|---|
| Transfer Time | 1-600S | 30s |
| Reclosing Delay Time | 1-600S | 30s |
| Overvoltage Protection | 110-300V | 140V |
| Undervoltage Protection | 80-220V | 90V |
| Overcurrent Protection | 1-80A | 63A |
6. Maintenance
The MARSTEK Automatic Transfer Switch is designed for minimal maintenance. However, regular checks are recommended to ensure optimal performance and safety:
- Visual Inspection: Periodically inspect the device for any signs of physical damage, loose connections, or overheating (discoloration, burnt smell).
- Cleaning: Ensure the ventilation openings are clear of dust and debris. Use a dry, soft cloth for cleaning the exterior. Do not use liquid cleaners.
- Connection Checks: Annually, or as needed, verify that all wiring connections are secure and free from corrosion.
- Functionality Test: If possible and safe to do so, periodically test the automatic transfer function by simulating a power source failure to ensure the switch operates correctly.
Warning: Always disconnect all power to the unit before performing any maintenance or inspection.
7. Troubleshooting
This section provides solutions to common issues you might encounter with your Automatic Transfer Switch. For problems not listed here, or if issues persist, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | No power to input terminals; incorrect wiring; internal fault. |
|
| Automatic transfer does not occur. | Voltage within acceptable range; transfer time setting too long; fault condition preventing transfer. |
|
| "Fault" indicator is lit. | Overvoltage, undervoltage, or overcurrent condition detected. |
|
| Inaccurate voltage/current readings. | Loose connections; sensor malfunction. |
|
8. Warranty and Support
Specific warranty information for the MARSTEK Automatic Transfer Switch is typically provided at the point of purchase or within the product packaging. Please refer to your purchase documentation for details regarding warranty coverage and duration.
For technical support, troubleshooting assistance beyond this manual, or warranty claims, please contact MARSTEK customer service through the retailer where the product was purchased or visit the official MARSTEK website for contact information.
