One-stop auto parts supplier
41-3669 High Pressure Sensor for Thermo King | High Pressure Cut-Out Switch
The 41-3669 High Pressure Sensor is a replacement high-pressure switch for selected Thermo King transport refrigeration units. It monitors refrigerant pressure and provides high-pressure protection for the refrigeration system.
Product Description
The 41-3669 High Pressure Sensor works as a High Pressure Cut-Out Switch (HPCO) in selected Thermo King refrigeration systems. Parts catalogs identify it as a high-pressure switch or pressure sensor switch.
The switch monitors high-side refrigerant pressure. When system pressure reaches the specified cut-out point, the switch helps protect the refrigeration system from excessive pressure.
Available parts references list a 375 PSI rating and a 1/8″ NPT male thread for the 41-3669. One technical catalog lists the switch opening at approximately 32.43 bar and closing at 25.87 bar.
The 41-3669 fits selected Thermo King SL, SLX, SLXe, SLXi, SB, SMX and Spectrum applications. Exact compatibility depends on the unit configuration and original part number.
Product Specifications
| Item | Details |
|---|---|
| Product Type | High Pressure Sensor / High Pressure Switch |
| Main Part Number | 41-3669 |
| Alternative Number | 413669 / 413-669 |
| Function | High Pressure Cut-Out |
| Pressure Rating | 375 PSI* |
| Thread | 1/8″ NPT Male* |
| Switch Type | HPCO Switch |
| Application | Thermo King Transport Refrigeration |
| Main Unit Series | SL, SLX, SLXe, SLXi, SB, SMX, Spectrum |
| Replacement Type | Aftermarket Replacement |
* Confirm the pressure rating and thread specifications against the original switch before ordering.
Main Function
- Monitors high-side refrigerant pressure.
- Provides high-pressure cut-out protection.
- Helps protect the refrigeration system from excessive pressure.
- Supports safe compressor operation.
- Provides pressure-based switching for the control circuit.
Common Replacement Symptoms
A faulty 41-3669 high-pressure switch may cause:
- High-pressure alarm
- Compressor shutdown
- Refrigeration system not starting
- Intermittent compressor operation
- Incorrect high-pressure protection
- Abnormal refrigeration performance
- Frequent pressure-related faults
Always check the refrigerant system, wiring, electrical circuit and pressure conditions before replacing the switch.
Application
The 41-3669 is listed for selected Thermo King transport refrigeration units, including:
| Series | Selected Applications |
|---|---|
| SL | SL-100, SL-200, SL-300, SL-400, SL-100e, SL-200e, SL-400e |
| SLX | SLX-100, SLX-200, SLX-300, SLX-400, SLX Spectrum |
| SLXe | SLXe-100, SLXe-200, SLXe-300, SLXe-400, SLXe Spectrum |
| SLXi | Selected SLXi and Spectrum models |
| SB | Selected SB-100, SB-110, SB-190, SB-200, SB-210, SB-230, SB-300, SB-310, SB-400 and SB-III units |
| SMX | Selected SMX applications |
| Spectrum | Spectrum-SL, Spectrum DE and other selected Spectrum units |
Hattink lists the 41-3669 for a broad group of SL, SLX, SLXe, SB, SMX and Spectrum units. Other catalogs also list SLXi applications.
Cross-Reference Part Numbers
Common reference numbers include:
- 41-3669
- 413669
- 413-669
- 41-1643
- 411-643
- 411643
- 9143C70G08
- 9143C70G09
- 41-PS17-10
- PMAX
- 55B
- PSH
Different catalogs list slightly different cross-reference numbers, so verify the original part number before substitution.
Similar Products
41-3670 High Pressure Switch
A similar Thermo King high-pressure switch, but it has different listed applications. Do not substitute it based only on appearance.
41-3845 High Pressure Switch
Another Thermo King high-pressure switch used on different direct-drive, truck and undermount applications.
42-1312 Pressure Sensor
A different Thermo King pressure transducer used for pressure monitoring. It should not be treated as a direct replacement for the 41-3669 HPCO switch.
Suitable Customers
- Thermo King parts distributors
- Transport refrigeration parts wholesalers
- Refrigeration repair companies
- Truck refrigeration service centers
- Trailer refrigeration service providers
- Thermo King aftermarket parts suppliers
- Fleet maintenance companies
Ordering Information
Please provide the original part number, Thermo King unit model, serial number, thread specification and switch type before ordering.
For replacement applications, confirm that the original component uses the 41-3669 / 413669 reference.
