In summary, Weidmüller’s Varitector PU (VPU) AC US series surge protection devices safeguard energy supply areas like renewable energy generation, process industry, and building infrastructure. The VPU AC US surge protection devices offer a leading price-performance ratio. The VPU AC US series is a complete line of surge protection devices tailored to the North American grid types and grounding systems, offering high system availability and unique features necessary in AC protection applications.