The Micrologic 6.0 H (harmonic measurement) is an electronic trip unit used with Masterpact NT circuit breakers. The trip unit is designed to protect circuits and loads. It has adjustable long-term overload protection, short-time delayed and instantaneous short-circuit protection. It also offers protection against earth faults. The Micrologic indicates an overload using an alarm LED. Other tripping causes are indicated by 3 additional LEDs. The device is equipped with a digital LCD screen on which the actual RMS values for the current are displayed with an accuracy of 1.5%. This trip unit can be integrated into a Masterpact NT basic switch.