Noted: When you first connect the product, you have to wait about 1 minute, after the red light turn off, then the product will work. The automatic recovery over voltage and under voltage protective device complies with modular design standards. the circuit boards of products adopt good quality electronic components with reliable performance. when the power situation is unstable. It's protection function will be automatically activated. once the voltage exceeds the limited range of products, it will automatically cut off so as to protect the safely of electrical equipment and persons. The device will re-supply in 1 minute, when the power returns to normal.The green indicator display, when the power is normal supply.The red indicator display, when the power over voltage or under voltage.Installing: 35mm Din rail. Main Technical Speacification OF 32A 1. Rated AC voltage 230V10% and frequency 50Hz/60Hz2. Paing Max Current: 32A3. Max. Loading power: 8.8KVA4. Over-voltage action cut-off value: >275VAC+/-5V5. Normal-voltage value: 165-275VAC6. Under-voltage action cut-off value: Main Technical Speacification OF 40A 1. Rated AC voltage 230V10% and frequency 50Hz/60Hz2. Paing Max Current: 40A3. Max. Loading power: 13.8KVA4. Over-voltage action cut-off value: >275VAC+/-5V5. Normal-voltage value: 165-275VAC6. Under-voltage action cut-off value: Main Technical Speacification OF 50A 1. Rated AC voltage 230V10% and frequency 50Hz/60Hz2. Paing Max Current: 50A3. Max. Loading power: 13.8KVA4. Over-voltage action cut-off value: >275VAC+/-5V5. Normal-voltage value: 165-275VAC6. Under-voltage action cut-off value: Main Technical Speacification OF 63A 1. Rated AC voltage 230V10% and frequency 50Hz/60Hz2. Paing Max Current: 63A3. Max. Loading power: 13.8KVA4. Over-voltage action cut-off value: >275VAC+/-5V5. Normal-voltage value: 165-275VAC6. Under-voltage action cut-off value: