Articles & Blogs > Protect Unmated DC Power Inputs with IP68 Sealed Barrel Jacks Contributed By DigiKey's North American Editors For electronic devices and systems that spend much of their lives unplugged, the DC power input can be a weak point in reliability. An exposed jack can be vulnerable to spray, dust, and other environmental hazards. These conditions can pose unacceptable risks to portable and battery-powered systems, including test equipment, medical devices, and tactical gear.