The PX3 offers an externally mounted surge solution that can be physically attached to the top or bottom of any panelboard, providing a reduced profile surge solution. PX3 suppression filter systems feature a powerful failure-free ISM™ (Integrated Suppression Module). Each MOV used in construction of the ISM is thermally fused and protected. The ISM also features surge-rated copper busing, robust filtering and advanced remote communication capabilities. The PX3 includes an internal disconnect option, allowing safer and easier repairs without having to cut power to the distribution panel.