0558008509 - ESAB RAS Series High Voltage Transformer Replacement

Fix Your RAS Plasma Cutter with the Genuine 0558008509 Transformer

If you are running an ESAB or L-TEC RAS or RAS-2 plasma cutter and experiencing issues with arc starting, the high voltage transformer is often the suspect. The ESAB 0558008509 is the direct replacement High Voltage Transformer for these classic machines. When you pull the trigger and hear gas flowing but get no pilot arc or a weak spark, it often indicates that the high-voltage circuit isn't delivering the punch needed to ionize the air gap. This OEM transformer is the fix you need to get that machine cutting metal again.

Plasma cutters rely on a high-voltage spike to establish the pilot arc. This transformer steps up the input voltage to the kilovolt range necessary for that initial breakdown. Because these machines are workhorses often used in tough shop environments, the original transformers can eventually fail due to internal shorts or insulation breakdown after years of service. Installing this genuine ESAB part ensures you are putting the correct resistance and turn ratio back into your machine, which is critical for protecting the rest of the HF start circuit and the main power board.

Installation and Safety Note: Replacing a high-voltage transformer requires opening the machine case. Always ensure the machine is unplugged and locked out/tagged out. Plasma cutters contain capacitors that can hold a lethal charge even after power is disconnected; always follow proper discharge procedures before touching internal components. This unit is designed to bolt right into the spot of the old XFMR, making the swap straightforward for a qualified technician.

Don't let a bad transformer turn your reliable RAS cutter into a doorstop. This part brings back the crisp, reliable starts these machines were known for. Whether you are maintaining a shop fleet or fixing up an older unit, the 0558008509 is the specific part required to restore the high-voltage ignition system to factory working order.