41-3847 high pressure sensor for Thermo King

41-3847 High Pressure Sensor for Thermo King | High Pressure Cut-Out Switch (HPCO)

The 41-3847 High Pressure Sensor is an aftermarket high-pressure cut-out switch for selected Thermo King transport refrigeration units. It monitors discharge pressure and helps protect the refrigeration system from excessive pressure.

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Product Description

The 41-3847 High Pressure Sensor works as a High Pressure Switch or High Pressure Cut-Out Switch (HPCO) in selected Thermo King refrigeration systems. It monitors high-side refrigerant pressure and switches the circuit when pressure reaches the specified limit.

Thermo King parts references identify 41-3847 / 1088A99G53 as the current reference, while 41-2998 / 1088A99G44 appears as an older reference.

Available technical data lists a 1/8″ NPT male thread, 32.43 bar opening pressure, 25.87 bar closing pressure, and a 380 mm cable. These specifications should match the original switch before replacement.

The 41-3847 is mainly used on selected Thermo King T-Series and TS-Series transport refrigeration units. Parts catalogs also list selected KD, MD and RD applications.

Product Specifications

ItemDetails
Product TypeHigh Pressure Sensor / High Pressure Switch
Main Part Number41-3847
Alternative Number413847 / 413-847
OEM Reference1088A99G53
Old Reference41-2998 / 1088A99G44
Switch TypeHigh Pressure Cut-Out / HPCO
Thread1/8″ NPT Male*
Open Pressure32.43 bar / approx. 470.3 PSI*
Close Pressure25.87 bar / approx. 375.1 PSI*
Cable Length380 mm*
ApplicationThermo King Transport Refrigeration
Main SeriesT-Series, TS-Series
Replacement TypeAftermarket Replacement

* Verify the original switch specifications before ordering.

Main Function

  • Monitors high-side refrigerant pressure.
  • Provides high-pressure cut-out protection.
  • Helps protect the compressor from excessive pressure.
  • Opens the circuit when pressure reaches the specified limit.
  • Supports safe refrigeration system operation.

Common Replacement Symptoms

A faulty 41-3847 high-pressure switch may cause:

  • High-pressure alarm
  • Compressor shutdown
  • Refrigeration system not starting
  • Intermittent compressor operation
  • Incorrect high-pressure protection
  • Abnormal cooling performance
  • Frequent pressure-related faults

These symptoms can also result from refrigerant charge, condenser airflow, wiring or other system problems. Check the complete refrigeration system before replacing the switch.

Application

The 41-3847 is listed for selected Thermo King truck and transport refrigeration units.

SeriesSelected Models
T-SeriesT-500R, T-560R, T-570R, T-580R
T-SeriesT-600, T-600R, T-680R, T-680S
T-SeriesT-800, T-800R, T-800R Spectrum, T-880R, T-880S
T-SeriesT-1000, T-1000R, T-1000R Spectrum, T-1000S
T-SeriesT-1080R, T-1080S
T-SeriesT-1200R, T-1200R Spectrum, T-1280 Spectrum
TS-SeriesTS-200, TS-300, TS-500, TS-600
Other ApplicationsSelected KD, MD and RD units

Exact compatibility depends on the unit configuration and original switch specification.

Cross-Reference Part Numbers

Common reference numbers include:

  • 41-3847
  • 413847
  • 413-847
  • 1088A99G53
  • 41-2998
  • 412998
  • 412-998
  • 1088A99G44
  • 41PS17-4
  • 20PS368-4

The 41-2998 / 1088A99G44 reference appears as an older number replaced by 41-3847 / 1088A99G53 in available parts catalogs.

Similar Products

41-3848 High Pressure Switch
A similar high-pressure switch, but available application data associates 41-3848 with different Thermo King equipment. Do not substitute it only because the appearance is similar.

41-3669 High Pressure Switch
Another Thermo King high-pressure switch with different application references. Check the original part number before replacement.

42-1312 Pressure Sensor
A pressure transducer used for pressure monitoring. It has a different function from the 41-3847 high-pressure cut-out 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 details before ordering.

For replacement applications, confirm the original 41-3847 / 1088A99G53 reference and compare the pressure specifications before installation.

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