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AQ L357 is a line protection IED with full scheme distance protection for transmission and sub-transmission line protection applications. It integrates a full range of line protection functions along with variety of additional functions for control, measurement, monitoring and communications. The AQ L357 comes in half of 19 inch arrangement and the AQ L397 comes in full 19 inch arrangement allowing for larger quantity of additional IO cards. The functionality is the same in both units.