9SS21002 - Lincoln Magnum & Magnum PRO Trigger Housing Assembly

Restore Precision Control to Your MIG Gun

A functioning trigger is vital for high-quality welding, serving as the direct link between the welder and the arc. The Lincoln Electric Trigger and Housing Assembly (9SS21002) is the definitive replacement part for worn, sticky, or broken triggers on your Magnum® or Magnum PRO MIG guns. Over time, the heat and physical abuse of the welding environment can cause trigger housings to crack or switches to fail intermittently. This genuine replacement assembly solves those issues instantly, providing a crisp, responsive trigger action that you can rely on for every bead.

This assembly is built tough. Lincoln Electric utilizes a high-grade, heat-resistant molded material that stands up to the radiant heat of high-amperage welding and the inevitable spatter that lands on the gun. Unlike inferior plastics that may become brittle or deform, this housing maintains its shape and protective qualities, ensuring the safety of the operator and the longevity of the gun. The standard non-interlocking design offers familiar, intuitive operation—simply press to weld and release to stop—giving you total control over your work.

Designed for the Pro

Whether you are running a Magnum PRO Curve 300 in a fabrication shop or a heavy-duty Magnum PRO HDE 550 in a manufacturing plant, this trigger assembly is the correct fit. Its modular nature means you don't have to fiddle with tiny springs and loose contacts; the assembly installs as a unit, making repairs quick and frustration-free. Keeping your equipment in top shape is key to producing consistent welds, and a reliable trigger is the starting point for every successful job.

Signs You Need a Replacement

If you experience intermittent arc starts, have to wiggle the trigger to get gas flow, or notice visible cracks in the trigger housing, it is time to replace the assembly. A compromised housing can expose internal components to dust and moisture, leading to further failure. Swapping in this fresh Lincoln Electric assembly is a cost-effective way to extend the life of your MIG gun and ensure safe, reliable operation day in and day out.