The ZJJ series DC ground fault detector can monitor the insulation condition of the DC bus and the grounding resistance of the positive and negative buses online in real-time. When the busbar-to-ground insulation drops to a certain value, the relay sends a warning signal. This ground fault monitoring device uses a fully static circuit, including a highly sensitive ground resistance monitoring and display circuit. When the insulation monitor falls below the set value, the ground fault monitoring relay sends a warning signal. This ground fault monitoring system features panel mount or DIN rail insulation monitoring relays.
This ground fault detector is used in DC main circuits, UPS systems, battery systems, IT systems with high leakage capacitance, and DC charging stations for electric vehicles.
This ZJJ series insulation monitoring relay utilizes a complete hardware divider operation circuit for the direct display of grounding resistance values. The alarm threshold is easily adjusted, set, and displayed on the panel. The ZJJ series includes ZJJ-4SC and ZJJ-4SA.
ZJJ-4SC DC Ground fault relay, with a compact size of 115X90X40, is installed on a din rail and features a dry contact alarm output for convenient installation and use. It can monitor voltage values within a wide range of 48-1500v, unaffected by measured voltage fluctuations, making it applicable in various fields such as DC speed motors and solar power generation.
ZJJ-4SA ground fault insulation monitoring relay adopts an instrument junction with the panel for specialized applications.
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