277/480VAC 3-Phase WYE, 7-Mode, Type 2 Panel Mounted Surge Protective Device with Integral Disconnect Switch, Includes Surge Counter. The Type 2 Panel Mounted Surge Protective Devices are designed for installation at the service entrance and at branch panels for critical equipment. These panels come equipped with integral disconnect switches replacing the need to go into the breaker panel when replacing a module. They provide dedicated surge protection for each phase to neutral, phase to ground and neutral to ground in three-phase WYE AC systems.