Digital ground continuity relay for AC systems


The GM420 monitors the ground conductor loop in AC systems. Three types of alarms may be used - a line resistance value (0...100 Ω), an OL alarm (when a very high resistance or break in the loop is detected), and an extraneous voltage between the two monitoring terminals. The loop resistance is displayed on the LCD screen in real-time. Two SPDT contact outputs are included and may be set to any combination of the alarms.

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