1. Product Overview
The Reliance Controls 31406CWK Pro/Tran Transfer Switch Kit is designed to safely connect a portable generator to your home's electrical system. This kit allows you to power selected circuits in your home during a power outage, ensuring a reliable backup power source. The transfer switch prevents backfeeding the utility line, which is crucial for safety and compliance with electrical codes. It is suitable for generators up to 7,500 watts equipped with NEMA L14-20 or L14-30 power outlets.

Image: The complete Reliance Controls 31406CWK Pro/Tran Transfer Switch Kit, including the transfer switch, power inlet box, and power cord.
2. What's in the Box
Your Reliance Controls 31406CWK kit includes the following components:
- Transfer Switch: The main unit for switching power sources.
- Power Inlet Box: For connecting the generator power cord to the home's wiring.
- Power Cord: A 30 Amp, 10-foot generator power cord with L14-30 ends.
- Wire Connectors: For electrical connections.
- L14-20 Cord End: An extra cord end for compatibility with smaller generators.

Image: Front view of the Reliance Controls 31406CWK Transfer Switch Kit, showing the transfer switch, power inlet box, and power cord.
3. Setup and Installation
Installation of the Reliance Controls 31406CWK Transfer Switch Kit involves working with high voltage electricity. It is strongly recommended that installation be performed by a qualified electrician to ensure safety and compliance with all local and national electrical codes.
Key Installation Steps (Overview):
- Mounting: Securely mount the transfer switch indoors, typically near your main electrical panel, and the power inlet box outdoors.
- Wiring: Connect the transfer switch to your main electrical panel and the outdoor power inlet box using appropriate gauge wiring. This involves connecting specific circuits from your main panel to the transfer switch.
- Circuit Selection: Identify and connect the circuits you wish to power with your generator to the transfer switch. The 31406CWK supports up to six circuits.
- Testing: After installation, thoroughly test the system with your generator to ensure proper functionality and safety.
Refer to the detailed wiring diagrams and instructions provided in the physical manual included with your kit for specific connection procedures.

Image: Side view of the Reliance Controls 31406CWK Transfer Switch Kit, showing the transfer switch and power inlet box.
4. Operating Instructions
Follow these steps to safely operate your Reliance Controls 31406CWK Transfer Switch during a power outage:
- Prepare Generator: Ensure your portable generator is placed in a well-ventilated area outdoors, away from windows and doors, and is properly fueled and maintained.
- Connect Generator: Plug the provided generator power cord into your generator's power outlet and then into the outdoor power inlet box.
- Start Generator: Start your generator according to its manufacturer's instructions and allow it to warm up.
- Switch Circuits: On the Pro/Tran transfer switch, move the toggle switches for the desired circuits from the 'LINE' position (utility power) to the 'GEN' position (generator power). Move one switch at a time. The middle 'OFF' position ensures no power is supplied to the circuit during the transition.
- Monitor Load: Use the integrated wattmeters on the transfer switch to monitor the power usage and avoid overloading your generator.
- Restore Utility Power: Once utility power is restored, turn off your generator. Then, move the toggle switches on the transfer switch back to the 'LINE' position, one at a time.
- Disconnect Generator: Unplug the generator power cord from the inlet box and store it safely.
Video: This video demonstrates the operation of a Pro/Tran transfer switch, showing how to switch circuits from utility power to generator power.
5. Maintenance
The Reliance Controls 31406CWK Transfer Switch is designed for durability and requires minimal maintenance. However, periodic checks are recommended:
- Visual Inspection: Annually inspect the transfer switch, power inlet box, and power cord for any signs of wear, damage, or loose connections.
- Cleanliness: Keep the unit free from dust, dirt, and debris. Use a dry cloth for cleaning.
- Connection Integrity: Ensure all electrical connections remain tight. Loose connections can lead to arcing and potential hazards. If you suspect loose connections, consult a qualified electrician.
- Generator Maintenance: Regularly service your portable generator according to its manufacturer's guidelines to ensure it operates reliably when needed.
6. Troubleshooting
If you encounter issues with your transfer switch, consider the following troubleshooting steps:
- No Power to Circuits (Generator):
- Ensure the generator is running and producing power.
- Verify the generator power cord is fully inserted and twisted into both the generator and the power inlet box.
- Check that the circuit breakers on the generator are not tripped.
- Confirm that the toggle switches on the transfer switch are fully in the 'GEN' position for the affected circuits.
- Check the circuit breakers within the transfer switch itself (if applicable) and your main electrical panel for tripped breakers.
- Wattmeters Not Registering:
- Ensure there is an active load on the circuits connected to the wattmeters.
- Verify all connections to the wattmeters are secure.
- Intermittent Power:
- This can often be caused by loose electrical connections. If you suspect this, immediately disconnect all power sources and consult a qualified electrician to inspect and tighten all wiring.
For persistent issues or if you are uncomfortable performing electrical checks, contact a qualified electrician or Reliance Controls customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | 31406CWK |
| Current Rating | 30 Amps |
| Operating Voltage | 250 Volts (AC) |
| Circuit Type | 6-way |
| Operation Mode | ON-OFF-ON |
| Max Generator Wattage | 7500 Watts |
| Power Cord Length | 10 feet |
| Product Dimensions (L x W x H) | 4.5 x 7 x 7.5 inches |
| Item Weight | 13.79 pounds |
| Certifications | cUL1008 listed |
8. Warranty and Support
The Reliance Controls 31406CWK Transfer Switch Kit is covered by a 5-year warranty. For warranty claims, technical assistance, or further support, please refer to the contact information provided in your product packaging or visit the official Reliance Controls website.
Always ensure to register your product if required to activate your warranty.