12V DC Auto Pressure Switch OEM-Quality Replacement with Automatic Pressure

Product Specification

Auto Pressure Switch 41-4146 / 41-4147 – Replacement for Thermo King Refrigeration Units

Product Overview

The High Quality New Auto Pressure Switch 41-4146 / 41-4147 is a reliable OEM-standard replacement part specially designed for Thermo King transport refrigeration units.
This pressure switch plays a critical role in monitoring and regulating the refrigerant system pressure, ensuring that the compressor operates within a safe pressure range to prevent system overload or failure.
By automatically opening or closing the circuit based on preset pressure thresholds, it provides stable cooling performance, protects critical components, and extends the service life of the entire refrigeration system.

Built from premium-grade metals and high-precision internal components, this switch offers exceptional durability, resistance to vibration, and consistent performance in demanding trucking and trailer environments.

Key Features & Benefits

• OEM-Quality Replacement – Fully compatible with Thermo King units and meets or exceeds factory specifications.

• Automatic Pressure Control – Safeguards the refrigeration circuit by controlling compressor operation under high or low pressure conditions.

• Durable Construction – Engineered with corrosion-resistant housing and precision diaphragms for long-lasting service.

• Enhanced Safety – Prevents system damage caused by excessive refrigerant pressure or loss of pressure.

• Quick Installation – Direct-fit design ensures simple replacement with minimal downtime.

• Stable Operation – Maintains consistent system performance in all weather conditions.

Applications

The 41-4146 / 41-4147 Auto Pressure Switch is suitable for a wide range of Thermo King truck and trailer refrigeration units, including models commonly used for:

• Refrigerated trucks and vans

• Long-haul trailer refrigeration systems

• Cold storage transport requiring continuous and precise temperature control

These switches are essential for maintaining safe operating pressures in Thermo King cooling circuits, protecting compressors, and ensuring uninterrupted refrigeration during transport.

Installation Tips

1. Safety Precautions – Power off the refrigeration unit and disconnect the battery before replacing the pressure switch.

2. Locate the Pressure Port – Identify the high or low pressure port as specified in your unit’s service manual.

3. Remove the Old Switch – Use the proper wrench to carefully disconnect the existing pressure switch.

4. Install the New Switch – Thread the 41-4146 or 41-4147 switch into place and tighten securely without over-torquing.

5. Reconnect Wiring – Attach the electrical connector and inspect for any leaks after installation.

6. System Test – Restart the unit and verify that the pressure switch activates correctly under normal operating conditions.

Technical Specifications

Summary

The Thermo King Auto Pressure Switch 41-4146 / 41-4147 is an essential spare part for maintaining safe and efficient refrigerant system operation.
Its rugged construction, automatic pressure regulation, and direct-fit compatibility make it a dependable and cost-effective solution for extending the life of Thermo King refrigeration units in trucking and cold-chain transport applications.

FAQ

Q1:When will you arrange the delivery?

A:Generally 1-2 weeks after the payment, and we will continually inform customer the goods carriage status, until you receive the goods.

Q2. Do you test all your goods before delivery?

A: Yes, we have 100% test before delivery.

Q3:Can we get the some technological training?

Our company provide the complete technological training, including: installation, use and maintenance.

Q4:How long is your products warranty?

A:The products of our lifetime for you to provide maintenance, one year warranty,Courier fees to pay half, after a year of maintenance fees shall be borne by the buyers.

Q5: How do you make our business long-term and good relationship?

A:1. We keep good quality and competitive price to ensure our customers benefit ; 2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.