The Micrologic 7.0 H (harmonic measurement) is an electronic trip unit used in Masterpact NT circuit breakers. The trip unit is designed to protect circuits and loads. It features an adjustable long-time overload protection, a short-time delayed protection, and an instantaneous short-circuit protection. Additionally, it offers residual current protection. The Micrologic indicates an overload with the help of an alarm LED. Other trip causes are displayed via three additional LEDs. The device is equipped with a digital LCD screen that shows the actual effective values for current with an accuracy of 1.5%. This trip unit can be integrated into a Masterpact NT main circuit breaker.