1. Product Overview
The Intermatic AG6503C3 is a Three Phase Type-1 Surge Protection Device designed to safeguard electrical systems and connected equipment from damaging voltage surges. This device is suitable for outdoor installations and various applications, including service entrance panels, utility meter cabinets, irrigation equipment, pumps, lighting fixtures, traffic signaling devices, farm equipment, HVAC controls, and motors.
Its robust design features parallel Metal Oxide Varistors (MOVs) from each line to a grounded neutral, enhancing product capability. The molded polycarbonate housing ensures durability, being both weatherproof and UV resistant. The AG6503C3 is specifically engineered for 347/600 Volt three-phase applications and complies with ANSI/UL1449 3rd Edition requirements.

Figure 1: Intermatic AG6503C3 Surge Protection Device. The device features a black polycarbonate housing and a visible green LED indicator light, signifying operational status.
2. Safety Information
WARNING: Risk of electric shock. Installation and servicing must be performed by qualified personnel only. Disconnect power before installation or servicing.
- Always follow local electrical codes and regulations.
- Ensure the power supply is completely disconnected before attempting any installation, wiring, or maintenance.
- Wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves.
- Do not install this device in locations subject to excessive vibration, corrosive gases, or flammable materials.
- Verify correct voltage and phase configuration before connecting the device.
3. Product Features
- Outdoor Installation: Designed for use in outdoor environments, including service entrance panels and utility meter cabinets.
- Advanced Surge Protection: Utilizes parallel MOVs from each line to grounded neutral for enhanced surge suppression capability.
- Durable Construction: Features a molded polycarbonate housing that is weatherproof and UV resistant.
- Easy Wiring: Equipped with 18-inch long, color-coded 10-gauge leads for straightforward installation.
- Voltage Compatibility: Specifically designed for 347/600 Volt three-phase applications.
- Compliance: Meets ANSI/UL1449 3rd Edition requirements.
- Status Indicator: A green LED light indicates that the product is energized and actively protecting connected devices.
4. Setup and Installation
This device is intended for installation by a qualified electrician. Refer to the wiring diagram provided with the product packaging for specific connection details. The following steps provide a general overview:
- Power Disconnection: Ensure all power to the installation site is completely disconnected at the main breaker or disconnect switch. Verify with a voltage tester.
- Mounting: Mount the AG6503C3 device securely in the desired outdoor location, such as a service entrance panel or utility meter cabinet. Ensure the mounting surface is stable and capable of supporting the device.
- Wiring Connections: The device comes with 18-inch long, color-coded 10 AWG leads. Connect these leads according to the provided wiring diagram and local electrical codes for 347/600 Volt three-phase systems.
- Connect the phase leads to the corresponding phase conductors.
- Connect the neutral lead to the system neutral.
- Connect the ground lead to the system ground.
- Secure Connections: Ensure all wire connections are tight and secure to prevent loose connections and potential hazards.
- Power Restoration: Once all connections are verified and the installation is complete, restore power to the system.
Note: The AG6503C3 is designed for applications such as irrigation equipment, pumps, lighting fixtures, traffic signaling devices, farm equipment, and HVAC controls. Consult the product datasheet for detailed application guidelines.
5. Operating Instructions
The Intermatic AG6503C3 operates automatically to protect against voltage surges. There are no user-adjustable settings.
- Status Indicator: A green LED light on the device indicates its operational status. When the green LED is illuminated, the device is energized and actively providing surge protection.
- Normal Operation: Under normal operating conditions, the green LED will remain lit.
- Surge Event: In the event of a voltage surge, the device will divert excess voltage to ground, protecting connected equipment. This process is instantaneous and does not require user intervention.
6. Maintenance
The Intermatic AG6503C3 is designed for minimal maintenance. Regular visual inspections are recommended to ensure continued optimal performance.
- Visual Inspection: Periodically inspect the device for any signs of physical damage, such as cracks in the housing, discoloration, or loose connections.
- LED Status Check: Regularly check the green LED indicator light. If the LED is not illuminated, it indicates that the surge protection module may have been compromised or the device is no longer providing protection. Refer to the Troubleshooting section.
- Cleaning: If necessary, gently clean the exterior of the device with a damp cloth. Do not use abrasive cleaners or solvents. Ensure power is disconnected before cleaning.
7. Troubleshooting
If you encounter issues with your Intermatic AG6503C3, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Green LED is not illuminated. |
|
|
| Device appears physically damaged. | Physical impact or extreme environmental conditions. | Disconnect power immediately. The device must be replaced by a qualified electrician. |
For issues not covered here, or if troubleshooting steps do not resolve the problem, contact Intermatic customer support or a qualified electrician.
8. Specifications
| Specification | Detail |
|---|---|
| Model Number | AG6503C3 |
| Brand | Intermatic |
| Type | Type-1 Surge Protection Device |
| Voltage Rating | 347/600 Volts (Three Phase) |
| Frequency Rating | 50/60 Hertz |
| Connection Type | 18-inch 10 AWG 4 Lead Wire |
| Housing Material | Molded Polycarbonate (Weatherproof and UV resistant) |
| Approvals/Standards | ANSI/UL 1449, CSA |
| Indicator | Green LED (Indicates protection status) |
| Dimensions (approx.) | 5.9 x 4.7 x 3.6 inches |
| Item Weight (approx.) | 1.05 pounds |
| Special Features | Surge Protection |
9. Warranty and Support
Warranty Description: Intermatic provides a warranty for this product, typically involving product replacement for defects. Specific terms and conditions may apply. Please refer to the official Intermatic warranty documentation included with your purchase or visit the manufacturer's website for the most current warranty information.
Customer Support: For technical assistance, warranty claims, or further information, please contact Intermatic customer support. Contact details can usually be found on the Intermatic official website or product packaging.
Manufacturer: Intermatic
Part Number: AG6503C3





