952015 - ESAB ESP-100i Pilot Arc Resistor Assembly

Technical Overview of the ESAB 952015 Pilot Arc Resistor

The ESAB 952015 is a specialized electrical component designed exclusively for the ESAB ESP-100i plasma cutting system. In plasma arc cutting, the pilot arc circuit is fundamental to the process, allowing the ionization of gas and the establishment of the plasma stream before the main cutting arc transfers to the workpiece. This resistor acts as a current-limiting device within that circuit, ensuring the pilot arc maintains the correct intensity without overloading the torch components or the power source.

As an OEM (Original Equipment Manufacturer) part, this resistor is manufactured to the precise resistance and power dissipation specifications required by the ESP-100i design. Using generic resistors in high-voltage plasma applications can lead to component failure, inconsistent arc starting, or damage to the main inverter board. The 952015 is built to withstand the thermal cycling and high-frequency electrical noise inherent in industrial plasma cutting environments.

Technicians troubleshooting ESP-100i units exhibiting "hard start" issues, failure to transfer arc, or complete lack of pilot arc should inspect the pilot arc resistor bank. A failed open resistor will prevent the pilot arc from establishing, rendering the machine unable to cut unless scratch-started (if supported). Replacing a damaged unit with this genuine ESAB part restores the machine to factory operating parameters, ensuring safety and reliability in industrial MRO applications.

Installation Note: This is an internal electrical component. Installation requires opening the machine chassis and should be performed by qualified personnel familiar with high-voltage electrical safety procedures and capacitor discharge protocols.