951997 - ESAB 400A Hall Effect Current Sensor 951997

Precision Control for Industrial Welding Power Sources

The ESAB 951997 Current Transducer (400A) is a critical electronic component designed for the maintenance and repair of high-performance ESAB welding machines. In modern inverter and chopper-based power sources, precise current regulation is the cornerstone of arc stability and weld quality. This transducer, often utilizing Hall Effect technology, serves as the eyes of the machine's control logic, providing real-time feedback on the actual output current being delivered to the arc. Without a functioning transducer, the power source cannot accurately adjust its output to match the welder's settings, leading to erratic behavior, poor fusion, or complete machine shutdown.

Rated for 400 Amps, this sensor is engineered to handle the rigorous demands of industrial fabrication environments. It is built to withstand the electromagnetic interference (EMI) and thermal fluctuations common inside high-amperage welding cabinets. When a current transducer fails, the symptoms can range from incorrect digital display readings to an unstable arc that fluctuates wildly regardless of the potentiometer setting. In some cases, the machine may detect the fault and enter a protective error mode, halting production entirely. Replacing a faulty unit with this genuine ESAB part ensures that the closed-loop control system is restored to factory specifications.

Sourcing genuine OEM parts like the 951997 is essential for maintaining the integrity of your equipment. Aftermarket or generic sensors may not possess the exact calibration curves or response times required by the ESAB control board, potentially leading to further damage or suboptimal welding characteristics. This unit is designed for direct integration into compatible ESAB power sources, ensuring that the mounting points and electrical connections align perfectly with the original machine architecture. Whether you are a certified service technician or an industrial maintenance manager, keeping your fleet operational with authentic components is the best way to protect your investment and ensure consistent weld procedures.