MT9/H-GRND

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Ground fault current interruption is an important aspect of electric power system protection. In general, ground fault current is detected and then disconnected from the other power source so that damage to the equipment and safety of personnel are prevented.
MT9/H-GRND is a series of ground fault current interrupting devices designed to detect and then interrupt ground fault currents up to 2400A. The series is suitable for use in either single or three-phase power systems. Each unit is equipped with a built-in micro-controller which enables the user to adjust trip thresholds as required and to program the device for multiple trips.
The MT9/H-GRND series uses the differential current principle and provides ground fault protection by comparing the current flowing in both legs of the system. When the current exceeds the set limit, the device will open the connected circuit breaker and trip. The ground fault current interruption is not just limited to the ground fault circuits as the MT9/H-GRND series can also be used to protect against short-circuits and full load current interruptions.
The working principle of the MT9/H-GRND series is based on the detection of an imbalance in the current flowing through each leg of the power system. This imbalance is detected by the device using the differential current principle. When the current passing through the legs of the system differs by more than the set trip threshold, the device will trip the connected circuit breaker . The device is designed to detect and then interrupt ground fault currents, short-circuits and full load currents.
To ensure optimal screening against ground faults, the MT9/H-GRND series integrates an optional ground fault loop-check system which can detect the current passing through the ground fault loop and trip the circuit breaker if the current exceeds the set limit. This system ensures that any ground fault is quickly detected and addressed and thereby avoids any unnecessary damage to the equipment or personnel.
The MT9/H-GRND series offers a compact design and is available in different configurations, allowing it to be installed in a variety of different applications. The series can be used for both LV and MV applications, with power ratings up to 2400A. In addition, the series is also available with remote communications, remote trip and reset features, and integrated analyzers for enhanced safety and system efficiency.
In summary, the MT9/H-GRND series of ground fault current interruption devices provides a reliable solution for ground fault detection and interruption in both single and three-phase power systems. The series utilizes the differential current principle to detect ground fault currents as well as short circuits and full load current interruptions. The built-in micro-controller provides users with adjustable trip thresholds as required and can be easily programmed for multiple trips. The series is available in a range of power ratings and configurations, making it suitable for use in a variety of applications.

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