Intermatic CD1-024R Compressor Defender Protects Central Air Conditioner / Heat Pump Compressors and Circuit Boards Surge, brownout and short cycle protection with 120, 208 and 240 vac loads LED indicators provide real-time status updates for quick and easy troubleshooting Auto-sense Voltage technology 120-240 vac universal input Voltage Meets ANSI/UL 1449 3Rd edition requirements UL listed for safety