Thermo King Two-Wire Refrigeration Door Position Switch 400907
Official OEM Thermo King parts catalog entry for the Thermo King 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 reliability for Thermo King refrigeration system door monitoring, ensuring accurate open/closed detection to protect cargo temperature and reduce unnecessary run-time on reefer equipment.
Product Overview
The Thermo King Switch, Door 2 Wire 400907 is a two-wire door switch engineered for transport refrigeration use. It detects door position on reefer trailers and refrigerated truck bodies to support control responses such as alarms, shutdowns, or mode changes. Constructed from premium materials, the switch supports durable operation in harsh, temperature-controlled environments.
Key Features & Customer Benefits
- Two-Wire Design – Simplifies integration with Thermo King control harnesses for reliable door status signaling.
- OEM-Grade Materials – Enhances durability and chemical resistance for longer service life in transport refrigeration applications.
- Precision Mounting Alignment – Switch and magnet mount parallel with aligned crosshairs to ensure consistent operation and reduce false alarms.
- 19 mm Maximum Gap – Maintains correct sensing with a tested gap of 19 mm (0.75 in.) between switch and magnet for dependable detection.
- Electrical Compatibility – Uses standard RED/BLACK two-conductor wiring; RED to digital input (DSP-02), BLACK to chassis ground (CHDS-02) for clear installation guidance.
- Fleet-Ready Reliability – Designed for reefer trailers and truck bodies to protect cargo temperature, support uptime, and reduce unnecessary fuel consumption from prolonged run cycles.
Product Details
| Part Number | 400907 |
| Product | Thermo King Switch, Door 2 Wire |
| Type | Two-wire door switch |
| Material | Premium OEM materials for temperature and chemical resistance |
| Mounting Gap | Maximum 19 mm (0.75 in.) between switch and magnet |
| Compatibility | Thermo King Precedent, Smart Reefer SR-4 systems, S-610M, S-610DE and associated control harnesses |
Efficiency & Sustainability
Accurate door-status monitoring helps maintain precise temperature control and reduces wasted compressor run-time, supporting fuel-efficient cooling strategies across fleets. The Switch, Door 2 Wire 400907 integrates with Smart Reefer SR-4 controls and aligns with Thermo King practices that support CARB Evergreen compliance where applicable, contributing to lower emissions and improved operational efficiency.
Installation & Maintenance Tips
Install the switch protected from physical damage and aligned parallel to its magnet with crosshairs matched. Maintain a maximum 19 mm gap; non-magnetic shims are acceptable to preserve spacing. Use OEM-quality connectors and 18 AWG (or OEM-specified) wire for harness runs. RED wire connects to the digital input (DSP-02) and BLACK to chassis ground (CHDS-02). Inspect during scheduled maintenance intervals and after any door-impact or body repair.
Real-World Applications
This door switch is appropriate for reefer trailers, refrigerated truck bodies, and any transport refrigeration installation that requires reliable door monitoring to protect perishable loads. It supports single- and multi-temperature units used across intermodal, food distribution, and temperature-controlled logistics.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
Backed by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance 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 visit contact.
Frequently Asked Questions
Q: Is this switch compatible with Thermo King Precedent units?
A: Yes. The Switch, Door 2 Wire 400907 is designed for secure integration with Precedent-series systems and common Thermo King control harnesses.
Q: What gap is required between the switch and magnet?
A: Maintain a maximum gap of 19 mm (0.75 in.) and align switch and magnet parallel with crosshairs matched to ensure reliable detection.
Q: Which wires connect to the refrigeration controller?
A: Use RED to the digital input (DSP-02) and BLACK to chassis ground (CHDS-02). Follow OEM wiring practices and use at least 18 AWG cable as specified for harnesses.
Q: Where is this switch commonly installed?
A: It mounts on swing-out or roll-up doors and in positions that avoid forklift or dock damage while maintaining magnet alignment for accurate sensing.
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 Thermo King 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 reliability for Thermo King refrigeration system door monitoring, ensuring accurate open/closed detection to protect cargo temperature and reduce unnecessary run-time on reefer equipment.
Product Overview
The Thermo King Switch, Door 2 Wire 400907 is a two-wire door switch engineered for transport refrigeration use. It detects door position on reefer trailers and refrigerated truck bodies to support control responses such as alarms, shutdowns, or mode changes. Constructed from premium materials, the switch supports durable operation in harsh, temperature-controlled environments.
Key Features & Customer Benefits
- Two-Wire Design – Simplifies integration with Thermo King control harnesses for reliable door status signaling.
- OEM-Grade Materials – Enhances durability and chemical resistance for longer service life in transport refrigeration applications.
- Precision Mounting Alignment – Switch and magnet mount parallel with aligned crosshairs to ensure consistent operation and reduce false alarms.
- 19 mm Maximum Gap – Maintains correct sensing with a tested gap of 19 mm (0.75 in.) between switch and magnet for dependable detection.
- Electrical Compatibility – Uses standard RED/BLACK two-conductor wiring; RED to digital input (DSP-02), BLACK to chassis ground (CHDS-02) for clear installation guidance.
- Fleet-Ready Reliability – Designed for reefer trailers and truck bodies to protect cargo temperature, support uptime, and reduce unnecessary fuel consumption from prolonged run cycles.
Product Details
| Part Number | 400907 |
| Product | Thermo King Switch, Door 2 Wire |
| Type | Two-wire door switch |
| Material | Premium OEM materials for temperature and chemical resistance |
| Mounting Gap | Maximum 19 mm (0.75 in.) between switch and magnet |
| Compatibility | Thermo King Precedent, Smart Reefer SR-4 systems, S-610M, S-610DE and associated control harnesses |
Efficiency & Sustainability
Accurate door-status monitoring helps maintain precise temperature control and reduces wasted compressor run-time, supporting fuel-efficient cooling strategies across fleets. The Switch, Door 2 Wire 400907 integrates with Smart Reefer SR-4 controls and aligns with Thermo King practices that support CARB Evergreen compliance where applicable, contributing to lower emissions and improved operational efficiency.
Installation & Maintenance Tips
Install the switch protected from physical damage and aligned parallel to its magnet with crosshairs matched. Maintain a maximum 19 mm gap; non-magnetic shims are acceptable to preserve spacing. Use OEM-quality connectors and 18 AWG (or OEM-specified) wire for harness runs. RED wire connects to the digital input (DSP-02) and BLACK to chassis ground (CHDS-02). Inspect during scheduled maintenance intervals and after any door-impact or body repair.
Real-World Applications
This door switch is appropriate for reefer trailers, refrigerated truck bodies, and any transport refrigeration installation that requires reliable door monitoring to protect perishable loads. It supports single- and multi-temperature units used across intermodal, food distribution, and temperature-controlled logistics.
Available for installation and service in Amarillo, Lubbock, Odessa, and throughout West Texas.
Backed by Thermo King’s engineering and supported by certified technicians at West Texas Thermo King, this component delivers lasting performance 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 visit contact.
Frequently Asked Questions
Q: Is this switch compatible with Thermo King Precedent units?
A: Yes. The Switch, Door 2 Wire 400907 is designed for secure integration with Precedent-series systems and common Thermo King control harnesses.
Q: What gap is required between the switch and magnet?
A: Maintain a maximum gap of 19 mm (0.75 in.) and align switch and magnet parallel with crosshairs matched to ensure reliable detection.
Q: Which wires connect to the refrigeration controller?
A: Use RED to the digital input (DSP-02) and BLACK to chassis ground (CHDS-02). Follow OEM wiring practices and use at least 18 AWG cable as specified for harnesses.
Q: Where is this switch commonly installed?
A: It mounts on swing-out or roll-up doors and in positions that avoid forklift or dock damage while maintaining magnet alignment for accurate sensing.
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.