1. Introduction
The Intermatic T40000Rt3 is an outdoor Type 3R load center equipped with a 300W transformer. This system is designed to provide a centralized, cost-effective, and easy-to-wire electrical control solution for various pool and spa installations. It serves as an enclosure capable of housing additional Intermatic mechanisms and components, allowing for a complete and integrated electrical setup.
1.1 Safety Information
WARNING: Risk of electric shock. Installation and servicing of this product should only be performed by qualified personnel. Always disconnect power at the circuit breaker or fuse box before installing or servicing. Failure to do so may result in serious injury or death.
- Read all instructions carefully before installation and operation.
- Comply with all national and local electrical codes.
- Ensure the enclosure is properly grounded.
- Do not operate if any part of the unit is damaged.
2. Package Contents
Verify that all components are present before beginning installation:
- One (1) Intermatic T40000Rt3 Timer Control System with 300W Transformer & Load Center
Note: Additional mechanisms or timers are sold separately and are not included with the base load center unit.
3. Specifications
| Feature | Detail |
|---|---|
| Model Number | T40000RT3 |
| Enclosure Type | Outdoor Type 3R |
| Transformer Wattage | 300W |
| Number of Circuits | 8 |
| Phase Type | Single Phase |
| Material | Alloy Steel |
| Product Dimensions | 7 x 7 x 7 inches |
| Product Weight | 27.15 Pounds (approx. 12.315 kg) |
| Country of Origin | United States |
| UPC | 078275125605 |
4. Installation and Setup
This section provides general guidelines for the installation of the T40000Rt3 load center. Always consult a qualified electrician and adhere to all local and national electrical codes.
4.1 Mounting the Enclosure
The T40000Rt3 is designed for outdoor use (Type 3R enclosure). Select a suitable, secure, and accessible location for mounting, away from direct water spray or excessive heat. Use appropriate hardware to securely fasten the enclosure to a sturdy surface. Ensure there is sufficient clearance around the unit for ventilation and access.

Figure 1: Front view of the Intermatic T40000Rt3 Load Center with the door open, revealing the internal layout, including the 300W transformer compartment at the top, the main breaker panel area with multiple slots for circuit breakers, and a lower compartment for wiring. A warning label regarding tripped breakers is visible on the inside panel.
4.2 Electrical Connections
IMPORTANT: Ensure all power is OFF at the main service panel before making any electrical connections.
- Power Input: Connect the incoming single-phase power supply to the designated terminals within the load center. Refer to the wiring diagram inside the enclosure for specific terminal locations.
- Load Connections: Connect the circuits for your pool/spa equipment (pumps, lights, heaters, etc.) to the appropriate circuit breaker slots. The unit supports up to 8 circuits.
- Transformer Wiring: The integrated 300W transformer is pre-wired for low-voltage applications, typically for pool/spa lighting. Verify connections as per the internal wiring diagram.
- Grounding: Ensure the load center is properly grounded according to electrical codes.
- Component Installation: If installing additional Intermatic mechanisms (e.g., mechanical or digital timers), follow their specific installation instructions and integrate them into the load center as designed.
5. Operation
Once installed and wired, the Intermatic T40000Rt3 functions as a central control point for your pool or spa electrical system.
5.1 Circuit Breaker Operation
The load center houses circuit breakers that protect your equipment from overcurrents and short circuits.
- Turning ON/OFF: To turn a circuit ON, push the breaker handle firmly to the "ON" position. To turn it OFF, push the handle to the "OFF" position.
- Tripped Breaker: If a circuit breaker trips, its handle will typically be in a mid-position between "ON" and "OFF". This indicates an overload or fault on that circuit. To restore service after a trip:
- First, move the breaker handle fully to the "OFF" position.
- Then, push the handle firmly to the "ON" position.
5.2 Transformer Operation
The integrated 300W transformer provides low-voltage power for compatible devices, such as pool lights. Ensure that the total wattage of connected low-voltage devices does not exceed 300W.
6. Maintenance
Regular maintenance helps ensure the longevity and safe operation of your Intermatic T40000Rt3 load center.
- Periodic Inspection: Annually inspect the enclosure for any signs of damage, corrosion, or water ingress. Ensure the door latch is secure.
- Cleanliness: Keep the exterior of the enclosure clean and free of debris. If opening the enclosure for inspection, ensure power is off and carefully remove any dust or foreign material from inside using a dry cloth or vacuum.
- Connection Check: Periodically, with power disconnected, check all electrical connections for tightness. Loose connections can cause overheating and potential hazards. This should be performed by a qualified electrician.
7. Troubleshooting
This section provides solutions to common issues. For problems not listed here, or if issues persist, contact a qualified electrician or Intermatic customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Circuit breaker trips repeatedly. | Overload on the circuit, short circuit, or faulty appliance/wiring. |
|
| No power to any circuits. | Main power supply issue, tripped main breaker (if installed), or loose main connections. |
|
| Low voltage devices (e.g., pool lights) are not working. | Faulty low-voltage wiring, overloaded transformer, or transformer issue. |
|
8. Warranty and Support
For information regarding the product warranty, please refer to the warranty card included with your purchase or visit the official Intermatic website.
For technical support, replacement parts, or further assistance, please contact Intermatic Customer Service. Contact details can typically be found on the manufacturer's website or on the product packaging.





