The ESAB 0558101100 is a specialized Metal Oxide Varistor (MOV) engineered for use in the power input and regulation stages of industrial welding equipment and plasma cutting systems. As a critical circuit protection component, this varistor is rated for a continuous operating voltage of 420V and possesses an energy absorption capacity of 160 Joules. Its primary function is to clamp transient voltage spikes—often caused by dirty power lines, generator fluctuations, or lightning strikes—protecting downstream semiconductor components such as IGBTs, MOSFETs, and rectifiers from overvoltage damage.
In the context of inverter-based power sources, the MOV acts as a sacrificial device or a voltage-dependent resistor. Under normal operating conditions, it presents a high impedance to the circuit. However, when the voltage across its terminals exceeds the rated clamping voltage, the MOV's resistance drops rapidly, shunting the excess current and dissipating the energy as heat. This specific unit (0558101100) is an OEM part sourced directly from ESAB, ensuring strict adherence to the original design specifications of the equipment it is intended to protect. Using generic substitutes with incorrect clamping voltages or energy ratings can compromise the safety margins of the power source, leading to potential board failures.
Technicians repairing ESAB equipment should verify the integrity of existing MOVs during routine maintenance or when diagnosing power failures. A physically damaged MOV (often indicated by charring, cracking, or a blown casing) is a clear sign that the machine has been subjected to a significant power surge. Replacement with this exact 420V 160J specification restores the protective barrier of the machine's input circuitry.
| Additional Information |
|---|
| Packaging Description:pack of 1 |
| ----- new values below ---- |
| Voltage Rating:420V |
| Energy Rating:160J |
| Component Type:Circuit Protection |
| OEM Part Number:0558101100 |
| Brand:ESAB |
| Item:Metal Oxide Varistor (MOV) |
| Packaging Description:1 Per Ea |
