994303 - ESAB 994303 Control Transformer 117V Primary 24V CT Secondary

Restore Your Welder's Brain Power with the ESAB 994303

If your ESAB welder powers on but the display remains dark, the wire feeder refuses to spin, or the contactor won't click in, you might be dealing with a failed control transformer. The ESAB 994303 is the genuine replacement part you need to get your machine back up and running. In many welding machines, the heavy lifting is done by the main transformer, but the "brains" of the operation—the circuit boards, gas solenoids, and user interface—rely on a smaller, dedicated control transformer like this one to provide a steady, low-voltage power supply.

This specific unit takes a 117-volt input (often tapped from the machine's main power switch or auxiliary circuit) and steps it down to a usable 24 volts (or 12 volts depending on the tap). Without this 24V signal, your welder's control board is effectively dead, even if the main breaker is on. A failing transformer might buzz loudly, smell like burning varnish, or simply show an "open circuit" when tested with a multimeter. Replacing it with a generic off-the-shelf part can be risky due to size constraints and specific voltage tap requirements; sticking with the OEM ESAB 994303 ensures the mounting holes line up and the voltage output is exactly what your machine's schematic calls for.

Installation and Troubleshooting Tips:
Before condemning your old transformer, use a multimeter to check for input voltage at the primary side. If you have 117V coming in but 0V coming out, your transformer is likely the culprit. When installing the new 994303, ensure your machine is completely disconnected from power. This unit is rated for 7.2 VA, meaning it is designed for control signals, not heavy loads, so ensure no shorts exist downstream (like a stuck solenoid) that might have caused the original part to fail. This transformer features a center-tapped secondary, providing flexibility for machines that might need both 12V and 24V references.

Don't let a small electrical component sideline your productivity. Keeping your equipment maintained with genuine ESAB parts helps preserve the longevity of the machine and ensures that safety systems, which often rely on this low-voltage power, function correctly. This part is a direct fit for specific ESAB models requiring the 117/12-12/24CT specification.