PolyPhaser AC Plug In Multi-Strike Power Protector PLDO-120US20A Power line extension protector.Power line extension protectorMulti-strike capabilityMaster on/off switchNRTL UL 1449 listed NRTL/C LR 106164-3Circuit breakered for added protection Specifications Let Through Voltage (Volts) 400.00 Turn On Voltage (Volts) 200 Oper. Temp (