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The ESAB 21933 Pressure Switch Assembly is a critical component designed for the maintenance and repair of the PT-25 plasma cutting torch. In pneumatic plasma cutting systems, the pressure switch serves as a vital safety interlock and operational control device. It monitors the incoming gas pressure (typically compressed air or nitrogen) to ensure it meets the minimum threshold required for cooling the electrode and stabilizing the plasma arc.
This specific assembly is designated as a "RETRO" or retrofit part, indicating it may serve as an updated replacement for earlier iterations of the pressure monitoring hardware found in PT-25 compatible machines. The switch operates by closing an electrical circuit only when the fluid pressure exerts sufficient force on the diaphragm or piston mechanism, thereby signaling to the power source that it is safe to initiate the pilot arc. Without a functioning pressure switch, the system may fail to arc, or worse, attempt to arc without sufficient cooling gas, leading to catastrophic failure of the torch head and consumables.
Technicians servicing ESAB plasma cutters utilizing the PT-25 torch should verify the integrity of the existing pressure switch if the machine exhibits flow errors or fails to ignite. The 21933 assembly is engineered to meet ESAB's OEM specifications for actuation pressure and electrical rating, ensuring a seamless integration into the control circuit. Proper installation of this component restores the machine's ability to self-diagnose flow conditions, maintaining compliance with safety standards and protecting the equipment investment.
Key Technical Specifications:
| Additional Information |
|---|
| Packaging Description:1 Per Ea, pack of 1 |
| Compatible Torch:PT-25 |
| Part Type:Pressure Switch Assembly |
| Application:Plasma Cutting |
