Thermo King Slim-Line Magnet-Activated Door Switch 2-Wire 400907
Official OEM Thermo King parts catalog entry for the Switch, Door 2 Wire 400907, 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 Switch, Door 2 Wire 400907 delivers OEM-grade control for Thermo King refrigeration systems and ensures precise door-status monitoring on reefer trailers. This slim-line, two-wire door switch helps reduce unit run time, support temperature control, and improve fuel-efficient cooling for transport refrigeration fleets across West Texas.
Key Features & Customer Benefits
- OEM 2-Wire Design – Simple red/black wiring supports quick integration with Thermo King controllers for reliable door open/close signaling.
- Slim-Line Mounting – Low-profile housing fits swing-out and roll-up doors for secure placement without obstructing loading operations.
- Magnet-Activated Operation – Works with an aligned magnet to automatically stop refrigeration unit run time when doors open, reducing fuel usage and engine wear.
- Compatibility with Thermo King Controls – Interfaces with Smart Reefer SR-4 and other Thermo King control systems to support event logging and door-status alarms.
- Durability for Fleet Use – Engineered for transport refrigeration environments to maintain reliability across frequent door cycles and temperature extremes.
- Operational ROI – Limits unnecessary run time for improved uptime, lower maintenance costs, and consistent cargo temperature control.
Product Details
| Part Number | 400907 |
| Product Name | Switch, Door 2 Wire |
| Function | Door open/close sensing to control refrigeration unit run state |
| Wiring | 2-wire (typical red = power, black = ground) |
| Mounting | Slim-line mount for swing-out and roll-up doors; uses a magnet aligned to switch |
| Compatibility | Thermo King refrigeration units including Smart Reefer SR-4 and common Precedent/DE series systems |
Efficiency & Sustainability — The Thermo King Switch, Door 2 Wire 400907 supports fuel-efficient cooling by reducing unnecessary refrigeration run time during loading and delivery. Integration with unit controllers such as Smart Reefer SR-4 enables precise temperature control and event logging, contributing to tighter CARB Evergreen and fleet efficiency programs where applicable.
Installation & Maintenance Tips — Mount the switch parallel to the door magnet, aligning cross hairs and maintaining the manufacturer-recommended gap (maximum ~19 mm / 0.75 in) using non-magnetic shims. Use OEM-quality connectors and 18 AWG wiring where specified, and inspect switch operation during scheduled maintenance intervals to ensure continued reliability.
Real-World Applications — The Switch, Door 2 Wire 400907 installs on reefer trailers and refrigerated trucks to automate door-status control for Thermo King units, improving temperature control during loading, reducing fuel usage, and limiting compressor hours across regional and long-haul operations. Commonly used on Diesel Direct Electric and Precedent S-610M / S-610DE applications where door monitoring increases uptime and cargo protection.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King 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: contact the service department for confirmation and claims handling.
Frequently Asked Questions
Q: Is the Switch, Door 2 Wire 400907 compatible with Smart Reefer SR-4 controls?
A: Yes. The switch interfaces with SR-4 and other Thermo King controllers to provide door-status input and event logging support.
Q: How does the switch improve fleet efficiency?
A: By automatically signaling unit shutdown when doors open, the switch reduces unnecessary compressor run time, lowers fuel consumption, and helps maintain setpoint temperatures during loading operations.
Q: What installation considerations ensure reliable operation?
A: Align the switch and door magnet parallel with correct gap spacing, use non-magnetic shims, secure OEM connectors, and verify wiring color codes for proper power and ground connections.
Related Resources
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 Switch, Door 2 Wire 400907, 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 Switch, Door 2 Wire 400907 delivers OEM-grade control for Thermo King refrigeration systems and ensures precise door-status monitoring on reefer trailers. This slim-line, two-wire door switch helps reduce unit run time, support temperature control, and improve fuel-efficient cooling for transport refrigeration fleets across West Texas.
Key Features & Customer Benefits
- OEM 2-Wire Design – Simple red/black wiring supports quick integration with Thermo King controllers for reliable door open/close signaling.
- Slim-Line Mounting – Low-profile housing fits swing-out and roll-up doors for secure placement without obstructing loading operations.
- Magnet-Activated Operation – Works with an aligned magnet to automatically stop refrigeration unit run time when doors open, reducing fuel usage and engine wear.
- Compatibility with Thermo King Controls – Interfaces with Smart Reefer SR-4 and other Thermo King control systems to support event logging and door-status alarms.
- Durability for Fleet Use – Engineered for transport refrigeration environments to maintain reliability across frequent door cycles and temperature extremes.
- Operational ROI – Limits unnecessary run time for improved uptime, lower maintenance costs, and consistent cargo temperature control.
Product Details
| Part Number | 400907 |
| Product Name | Switch, Door 2 Wire |
| Function | Door open/close sensing to control refrigeration unit run state |
| Wiring | 2-wire (typical red = power, black = ground) |
| Mounting | Slim-line mount for swing-out and roll-up doors; uses a magnet aligned to switch |
| Compatibility | Thermo King refrigeration units including Smart Reefer SR-4 and common Precedent/DE series systems |
Efficiency & Sustainability — The Thermo King Switch, Door 2 Wire 400907 supports fuel-efficient cooling by reducing unnecessary refrigeration run time during loading and delivery. Integration with unit controllers such as Smart Reefer SR-4 enables precise temperature control and event logging, contributing to tighter CARB Evergreen and fleet efficiency programs where applicable.
Installation & Maintenance Tips — Mount the switch parallel to the door magnet, aligning cross hairs and maintaining the manufacturer-recommended gap (maximum ~19 mm / 0.75 in) using non-magnetic shims. Use OEM-quality connectors and 18 AWG wiring where specified, and inspect switch operation during scheduled maintenance intervals to ensure continued reliability.
Real-World Applications — The Switch, Door 2 Wire 400907 installs on reefer trailers and refrigerated trucks to automate door-status control for Thermo King units, improving temperature control during loading, reducing fuel usage, and limiting compressor hours across regional and long-haul operations. Commonly used on Diesel Direct Electric and Precedent S-610M / S-610DE applications where door monitoring increases uptime and cargo protection.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
View all Thermo King PartsBacked by Thermo King 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: contact the service department for confirmation and claims handling.
Frequently Asked Questions
Q: Is the Switch, Door 2 Wire 400907 compatible with Smart Reefer SR-4 controls?
A: Yes. The switch interfaces with SR-4 and other Thermo King controllers to provide door-status input and event logging support.
Q: How does the switch improve fleet efficiency?
A: By automatically signaling unit shutdown when doors open, the switch reduces unnecessary compressor run time, lowers fuel consumption, and helps maintain setpoint temperatures during loading operations.
Q: What installation considerations ensure reliable operation?
A: Align the switch and door magnet parallel with correct gap spacing, use non-magnetic shims, secure OEM connectors, and verify wiring color codes for proper power and ground connections.
Related Resources
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.
