Hensel Electric India Pvt. Ltd offers Under-Voltage Release Equipment. Hensel Electric India Pvt. Ltd is an ISO 9001: 2000 certified company. The Under-Voltage Release Equipment is used for 16-630A circuit-breakers. The closing of the contacts happens with voltages above 0.85 x Un. This equipment comes in AC 50/60 Hz, 200 to 240 V ranges.