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High Performance Current Sensing for Automation

High Performance
Current Sensing for Automation

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Ground Fault Protection Solutions

Designed & Assembled in the USA

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What is an Industrial Ground Fault Sensor?

Comprehensive Ground Fault Protection Solutions by NK Technologies

NK Technologies excels in manufacturing advanced ground fault relays for diverse AC circuit monitoring. These relays efficiently operate breakers and seamlessly transmit alarms. Most models hold UL recognition, ensuring compliance with UL1053, the industry standard. Our meticulous factory adjustments guarantee reliable performance. You can confidently rely on NK Technologies Relays for comprehensive ground fault protection solutions.

Some models offer adjustable trip points for inductive loads like motors or transformers. This feature is essential due to the nature of motors, which consist of winding small varnish-insulated wire around laminated steel cores. Even minor insulation imperfections within these motors can allow tiny amounts of electricity to pass to the ground through the motor frame. While the industry standard for equipment ground fault protection is 30mA, imperfections can quickly generate 30mA fault currents. In such cases, installers can conveniently adjust the trip point to a higher level, preventing spurious relay tripping.

Detecting Earth Leakage with Ease through NK Technologies’ Ground Fault Protection

The illustration on the right visually represents an NK Technologies ground fault relay. It is powered directly from the primary (load-carrying) circuit through a control power transformer. Notably, the relay can be powered using either 120 VAC or 24 VAC/DC, ensuring compatibility with various setups. The relay’s output is a single-pole, double-throw relay, making it the optimal choice for operating a shunt trip circuit breaker’s operating mechanism.

When utilizing the -DEN model contact action, the relay exclusively activates the output relay when a fault exceeds the setpoint. Upon applying power to the relay, an illuminating LED visually indicates its operation, while another LED indicates when the relay successfully trips. Notably, the primary circuit voltage can safely reach up to 600 volts AC, adhering to UL requirements. However, it’s crucial to remember that all current-carrying conductors, including the neutral if used by the load, must pass through the relaying aperture to ensure proper functionality.

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Ground Fault Applications

  • Heat tracecable
  • Snow melt mats
  • Industrial heating
  • Submersible pumps
  • UV light systems
  • Semiconductor fabrication
  • Pool lighting
  • Soil heating mats


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