NK Technologies: Ground fault sensor

The 2011 NEC requires ground fault protection of the main over-current device feeding marinas and boatyards, where these services often carry up to 800 amps. Most sensor designs do not allow the conductors to pass through a single sensing ring, requiring a separate sensing device such as a zero-sequence current transformer. The AG-LC Series resolves this issue with an innovative large solid-core housing design that provides ample space for multiple conductors to pass easily through one sensing window.

Key applications include:

• Monitoring large machines: Detecting leakage to earth before the problem can cause damage

• Water treatment and delivery: Keeping pumping systems safe and in operation

• Generators: Shut down equipment when leakage current exceeds hazardous levels

AG-LC Series highlights include:

• Electromechanical relay output provides both normally open and normally closed contacts

• Compatible with most automation and control systems

• Externally powered – choice of fail-safe or standard operation

• Simple field setpoint adjustment

• Adjustable time delay

• DIN Rail or panel mount