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Totaline PB39 & PB40 High Pressure Switch
Compact fixed-setting high pressure switches for air-conditioning and refrigeration systems, designed to respond when system pressure reaches a predetermined high-pressure cut-out point.
PB39 PB40 High Pressure Fixed Setting HVACR Refrigeration⚙️ Totaline High Pressure Switch
The Totaline PB39 and PB40 High Pressure Switches are compact pressure controls designed for compatible air-conditioning and refrigeration applications.
A high-pressure switch monitors the pressure on the high side of the refrigeration circuit. When pressure rises to the specified OFF pressure, the switch changes electrical state and can be incorporated into the equipment's control circuit to interrupt compressor operation or provide a high-pressure signal.
After the pressure falls to the specified ON pressure, the switch returns to its normal operating state according to the system's control arrangement.
No pressure adjustment is required. Select the correct PB39 or PB40 according to the required ON/OFF pressure settings and the equipment manufacturer's specifications.
📋 Available Models
Totaline PB39
ON 276 PSI / OFF 396 PSI High Pressure Fixed Setting Automatic OperationHigh-pressure switch with a fixed 396 PSI cut-out and 276 PSI reset / ON pressure.
ON: 276 PSI ≈ 19.0 bar
OFF: 396 PSI ≈ 27.3 bar
Totaline PB40
ON 270 PSI / OFF 360 PSI High Pressure Fixed Setting Automatic OperationHigh-pressure switch with a fixed 360 PSI cut-out and 270 PSI reset / ON pressure.
ON: 270 PSI ≈ 18.6 bar
OFF: 360 PSI ≈ 24.8 bar
🔄 How a High Pressure Switch Works
The refrigeration compressor operates and high-side pressure is monitored.
Condensing pressure increases due to the system's operating conditions.
The pressure switch changes state at its specified high-pressure cut-out point.
The equipment's properly designed control circuit responds to the pressure-switch signal.
High-side pressure decreases after the cause of excessive pressure is removed.
The switch returns at the specified ON / reset pressure.
🛡️ Why High Pressure Control Is Important
Abnormally high condensing pressure can occur when a refrigeration or air-conditioning system is operating outside its intended conditions.
⭐ Key Features & Benefits
🏭 Typical Applications
🔧 How to Select PB39 or PB40
| Selection Point | What to Check |
|---|---|
| Model | Confirm whether the equipment requires PB39 or PB40. |
| OFF / Cut-Out Pressure | PB39 = 396 PSI PB40 = 360 PSI |
| ON / Reset Pressure | PB39 = 276 PSI PB40 = 270 PSI |
| Pressure Connection | Confirm the fitting and connection arrangement against the original equipment. |
| Electrical Connection | Confirm wiring arrangement and electrical rating of the exact switch. |
| System Application | Check the equipment manufacturer's pressure-control requirements before installation. |
| Refrigerant | Verify the switch is approved for the refrigerant and operating pressures of the actual system. |
📌 Understanding ON & OFF Pressure
PB40: 270 PSI ON → Pressure Rises → 360 PSI OFF
Totaline High Pressure Switch Supplier Malaysia
RNA Engineering & Trading Sdn Bhd supplies Totaline HVACR spare parts and pressure-control components for air-conditioning, commercial refrigeration and cooling-system applications.
Contact our team for pricing, availability, replacement matching and product selection.
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