- N62400 series is developed based on NGI's years of experience in testing for fuel cell. It is with high accuracy, high reliability and high cost performance. N62400 can load high current under ultra-low voltage. The minimum operating voltage when loading 1200A can be low to 0.2V. It is designed in a 19 inch 3U chassis, which is available for benchtop use or installation in 19 inch rack.