The NL-5557 Spark Protector Series is a dedicated anti-sparking protection tube designed specifically for RF/HF welding and heating machines. Installed in the HF generator circuit, it senses over-current or arcing and works with a fast electronic control circuit to cut off HF output, preventing tube burnout and mold damage. The NL-5557 series is widely adopted in high frequency plastic welding machines due to its high sensitivity and reliable protection performance.
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