K2752-4 - Lincoln DownFlex Automatic Start/Stop Current Sensor

Hands-Free Fume Control for the Professional Welder

Focus on your bead, not your switch. The Lincoln Electric K2752-4 Current Activated Start/Stop Sensor is designed to make your welding day smoother and quieter. If you are working with a DownFlex 400-MS/A downdraft table, you know the hassle of constantly walking around the table to turn the fan on before a weld and off again to talk to a coworker or check a print. This accessory eliminates that distraction entirely, giving you a fully automated, responsive workstation that reacts to your torch.

The K2752-4 features a durable metal clamp with a built-in sensor that attaches directly to your welding ground cable. It is sensitive enough to detect the start of an arc instantly, turning on the downdraft fan the moment you strike. Whether you are blasting heavy MIG welds or running delicate TIG passes, the sensor picks up the current flow reliably. It is specifically calibrated to handle the nuances of TIG (GTAW) welding, ensuring that even low-amperage work triggers the extraction system effectively. Note that because it relies on welding current, this sensor will not activate the fan for non-welding tasks like grinding or plasma cutting unless the arc is active.

Installation takes seconds. The clamp secures around your work lead, and the integrated cable connects to the dedicated socket on the back of your DownFlex table. There are no batteries to change or complicated settings to program. Once installed, it works in the background, reducing the constant drone of the fan when you aren't welding. This creates a more pleasant work environment, allowing for easier communication and less fatigue from constant noise exposure. It also ensures that you never forget to turn the fume extractor on, keeping your breathing zone protected automatically every time you weld.

This unit is built to withstand the rigors of a welding shop. The cabling is shielded and durable, and the clamp mechanism is designed for a secure fit that won't slip during repositioning of the ground clamp. It is the perfect addition for welders who value convenience, safety, and a professional-grade setup.