W7004952 - Fabricator 181i Primary Current Sensor Replacement

Restore Your Fabricator 181i Performance

Is your Fabricator 181i acting up? If you are experiencing erratic arc issues, output fluctuations, or if the machine is tripping error codes related to power output, the issue might be a faulty current sensor. The W7004952 Primary Current Sensor is the genuine replacement part you need to get your welder back up and running smoothly. This small but mighty component acts as the "eyes" of your welder's computer, telling it exactly how much power is being drawn so it can adjust the arc instantly.

When a current sensor fails, the machine often goes into a safety mode or produces an unstable arc because it "thinks" the current is too high or too low. Replacing it with this OEM part ensures that your machine reads the power correctly again. Don't risk your expensive welder with salvaged or mismatched electronics; this part is designed specifically for the 181i platform (often branded under Thermal Arc, Tweco, or ESAB).

Installation typically involves accessing the internal electronics of the machine. While it is a direct replacement, we always recommend unplugging the machine and allowing capacitors to discharge before servicing. Once installed, this sensor restores the tight control loop that makes the 181i such a great welder, giving you back the buttery smooth MIG, TIG, or Stick arc you rely on.

Symptoms of a Bad Sensor

• Machine output does not match the dial setting.
• Arc is unstable or "stutters" during welding.
• Over-current or general fault lights trigger immediately upon striking an arc.
• Machine powers on but has zero output.