... -3000VA)Over voltage protection: 246V±4VFrequency: 50Hz/60HzUsage area: computer, copy machine, testing equipments, lighting equipments, TV equipments, medical equipments, communicating equipments ... : 426V±7VLow voltage protection: 318V±7VFrequency: 50Hz/60HzUsage area: computer, copy machine, testing equipments, lighting equipments,TV equipments, medical equipments, communicating equipments ...