The CHINT NJVA1 Series devices are designed to protect electrical systems. They are voltage and current protectors, likely rated for 63A, 100A. These devices safeguard equipment from damage caused by voltage fluctuations (overvoltage or undervoltage) and excessive current. They automatically cut off the power supply when dangerous conditions occur, preventing damage to connected appliances and reducing the risk of electrical fires. This type of device helps ensure the safe and reliable operation of electrical installations in homes, businesses, and industrial settings. Features: Protection: Overvoltage, undervoltage, and overcurrent protection. Automatic Reconnection: Restores power automatically after a fault. Digital Display: Shows voltage and current readings. Modular Design: This is designed for easy installation and maintenance. Adjustable Parameters: Settings for overvoltage, undervoltage, and overcurrent can be adjusted. Time Delay: Adjustable time delay for the power supply after energizing and de-energizing. Specifications: Poles: 1P+N, 3P+N Rated Operating Voltage: AC 230V, AC 400V Rated Frequency: 50Hz Rated Current: 100A/3P+N-63A adjustable (63A default), 10A-100A adjustable (100A default) Undervoltage Action Cut-off Value: 140V-200V adjustable (170V default) Overvoltage Action Cut-off Value: 240V-300V adjustable (270V default) Power-on Delay Time: 1-300s adjustable (5s default) Reset Delay Time After Overcurrent Protection: 5-300s adjustable (30s default) Mounting: Standard DIN-rail mounting Uses: Protection of electrical equipment in: AC power systems Generator sets Substations Factories Machine rooms Prevention of damage due to: Power surges Undervoltage Overcurrent Package includes: 1x CHINT NJVA1 Series V+A Protector Device