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Thermo King OEM 12V Relay 1PDT 40/30A 5-Pin 449111
Official OEM Thermo King parts catalog entry for the Thermo King Relay 449111, 1PDT, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King Relay 449111, 1PDT is a durable 12-volt electromechanical relay engineered to deliver dependable switching for Thermo King refrigeration systems in transport refrigeration applications. This relay supports precise temperature control and consistent operation across demanding reefer environments.
West Texas Thermo King specifies this OEM-grade relay to preserve uptime for fleets operating reefer trailers and refrigerated trucks throughout the Southwest, including Amarillo, Lubbock, Odessa, and the Permian Basin.
- 12-Volt Rating – Provides compatibility with standard Thermo King electrical systems for straightforward replacement and reliable operation.
- High Current Capacity (40/30A) – Handles compressor and accessory loads to maintain stable cooling and protect system components.
- 5-Pin Configuration – Offers secure connections and clear terminal layout for efficient diagnostics and serviceability.
- 1PDT (Single-Pole Double-Throw) – Ensures precise, repeatable switching action for control circuits and safety interlocks.
- OEM Fit and Finish – Matches Thermo King mounting and electrical specifications to minimize installation time and prevent fitment issues.
- Fleet-Grade Reliability – Engineered to support continuous operation, reducing downtime and improving return on investment for transport refrigeration fleets.
Product Details
| Part Number | 449111 |
| Product Name | Thermo King Relay, 1PDT |
| Voltage | 12 V |
| Amperage | 40/30 A |
| Pins | 5 |
| Type | Single-Pole Double-Throw (1PDT) |
| Compatibility | Thermo King SD, RD, MD, KD, V-250 series transport refrigeration units |
Efficiency & Sustainability
This OEM relay supports precise control of refrigeration cycles, contributing to fuel-efficient cooling and consistent temperature control across transport refrigeration operations. When installed as part of compliant Thermo King systems, the component integrates into broader fleet emissions and efficiency strategies such as Smart Reefer and Diesel Direct Electric architectures and aligns with initiatives like CARB Evergreen through proper system-level configurations.
Installation & Maintenance Tips
Use correct OEM-style terminal connectors and secure mounting hardware during installation to ensure reliable electrical contact and vibration resistance. Inspect relay terminals and mounting points during routine service intervals and replace the relay promptly when diagnostics indicate intermittent switching or contact wear. Follow Thermo King service procedures for safe handling of control circuits.
Real-World Applications
The Thermo King Relay 449111, 1PDT is ideal for reefer trailers, refrigerated trucks, and transport refrigeration units where compact, reliable switching is required for compressors, fans, and control circuits. Fleet operators in long-haul and regional distribution rely on this relay to protect components and maintain continuous temperature-controlled transport across West Texas and the Southwest.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting reliability and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, please contact us for warranty information or contact the service department for confirmation.
Frequently Asked Questions
Q: Is this relay compatible with Thermo King SD and RD units?
A: Yes. The Relay 449111, 1PDT is specified for use in Thermo King SD and RD series units and other compatible transport refrigeration models listed in the product details.
Q: What voltage and current ratings should technicians expect?
A: The relay is rated at 12 volts with a 40/30 amp switching capacity and a 5-pin configuration for standard Thermo King control circuits.
Q: Can this relay be installed during scheduled maintenance windows?
A: Yes. Technicians replace relays during routine service intervals to maintain control integrity; follow Thermo King service guidelines for safe installation and testing.
Q: Who supports installation and parts verification in West Texas?
A: Certified technicians at West Texas Thermo King provide parts verification, installation, and fleet support across Amarillo, Lubbock, Odessa, and surrounding regions.
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.
Official OEM Thermo King parts catalog entry for the Thermo King Relay 449111, 1PDT, verified by PEAK Thermo King and West Texas Thermo King Texas, Utah, Wyoming, Washington, Oregon, serving all of the USA.
Built for Performance: The Thermo King Relay 449111, 1PDT is a durable 12-volt electromechanical relay engineered to deliver dependable switching for Thermo King refrigeration systems in transport refrigeration applications. This relay supports precise temperature control and consistent operation across demanding reefer environments.
West Texas Thermo King specifies this OEM-grade relay to preserve uptime for fleets operating reefer trailers and refrigerated trucks throughout the Southwest, including Amarillo, Lubbock, Odessa, and the Permian Basin.
- 12-Volt Rating – Provides compatibility with standard Thermo King electrical systems for straightforward replacement and reliable operation.
- High Current Capacity (40/30A) – Handles compressor and accessory loads to maintain stable cooling and protect system components.
- 5-Pin Configuration – Offers secure connections and clear terminal layout for efficient diagnostics and serviceability.
- 1PDT (Single-Pole Double-Throw) – Ensures precise, repeatable switching action for control circuits and safety interlocks.
- OEM Fit and Finish – Matches Thermo King mounting and electrical specifications to minimize installation time and prevent fitment issues.
- Fleet-Grade Reliability – Engineered to support continuous operation, reducing downtime and improving return on investment for transport refrigeration fleets.
Product Details
| Part Number | 449111 |
| Product Name | Thermo King Relay, 1PDT |
| Voltage | 12 V |
| Amperage | 40/30 A |
| Pins | 5 |
| Type | Single-Pole Double-Throw (1PDT) |
| Compatibility | Thermo King SD, RD, MD, KD, V-250 series transport refrigeration units |
Efficiency & Sustainability
This OEM relay supports precise control of refrigeration cycles, contributing to fuel-efficient cooling and consistent temperature control across transport refrigeration operations. When installed as part of compliant Thermo King systems, the component integrates into broader fleet emissions and efficiency strategies such as Smart Reefer and Diesel Direct Electric architectures and aligns with initiatives like CARB Evergreen through proper system-level configurations.
Installation & Maintenance Tips
Use correct OEM-style terminal connectors and secure mounting hardware during installation to ensure reliable electrical contact and vibration resistance. Inspect relay terminals and mounting points during routine service intervals and replace the relay promptly when diagnostics indicate intermittent switching or contact wear. Follow Thermo King service procedures for safe handling of control circuits.
Real-World Applications
The Thermo King Relay 449111, 1PDT is ideal for reefer trailers, refrigerated trucks, and transport refrigeration units where compact, reliable switching is required for compressors, fans, and control circuits. Fleet operators in long-haul and regional distribution rely on this relay to protect components and maintain continuous temperature-controlled transport across West Texas and the Southwest.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting reliability and uptime assurance for fleet operations.
For product verification or service assistance, call (806) 376-5837.
For current warranty eligibility or OEM replacement coverage, please contact us for warranty information or contact the service department for confirmation.
Frequently Asked Questions
Q: Is this relay compatible with Thermo King SD and RD units?
A: Yes. The Relay 449111, 1PDT is specified for use in Thermo King SD and RD series units and other compatible transport refrigeration models listed in the product details.
Q: What voltage and current ratings should technicians expect?
A: The relay is rated at 12 volts with a 40/30 amp switching capacity and a 5-pin configuration for standard Thermo King control circuits.
Q: Can this relay be installed during scheduled maintenance windows?
A: Yes. Technicians replace relays during routine service intervals to maintain control integrity; follow Thermo King service guidelines for safe installation and testing.
Q: Who supports installation and parts verification in West Texas?
A: Certified technicians at West Texas Thermo King provide parts verification, installation, and fleet support across Amarillo, Lubbock, Odessa, and surrounding regions.
Ask about fleet-wide parts programs through West Texas Thermo King.
Produced by a certified Thermo King dealership, West Texas Thermo King | a Division of PEAK Industrial. Servicing fleets across Amarillo, Lubbock, and Odessa.
