NK AG1-NCAC-120-NF-950 - Ground Fault (Earth Leakage) Relay - Solid-State Output

AG Series Ground Fault Detectors help protect people, products, and processes from damage by ground fault conditions by monitoring all current-carrying conductors in grounded single- and three-phase delta or wye systems.

Ground Fault Protection Applications

• Personnel Protection (typically 5 mA)
  • Detects sensitive ground fault conditions, which may be injurious to personnel and processes.
  • Functions as sensor and alarm trigger when part of an overall ground fault protection system.
• Equipment Protection (typically 10 mA or 30 mA)
  • For applications where personal protection is not the primary concern, higher setpoint capability helps eliminate nuisance tripping while still providing adequate ground fault detection to protect machine electronics.
• Regulatory
  • Meets requirements as stipulated by governmental and industrial regulatory groups for ground fault sensing.

Ground Fault Protection Features

• Broad Range of Options to Match Application Needs
  • N.O./N.C. solid-state switch or mechanical relay outputs.
  • Normally energized or normally de-energized contacts.
  • Noise Immunity option for use in EMI/RFI sensitive environments.
• Setpoint Options Maximize Ease-of-Use
  • Field-selectable 5 mA, 10 mA or 30 mA setpoints on the AG3 “Tri-set” model makes user adjustments fast, sure and convenient.
  • Single factory-calibrated setpoints available form 5 mA to 950 mA.
• Compatible with Standard Equipment
  • Applicable on single- and three-phase systems.
  • Ideal for use with shunt trip breakers.
  • Magnetically isolated from monitored circuit and control power.
• UR/cUR and CE Approved
  • Accepted worldwide.

“Zero Sum” Operating Principle:

In single and three-phase AC systems, under normal conditions current flows from the power source to the load and back to the source. As a result, the electromagnetic fields surrounding the conductors cancel, producing a “zero sum current” even when the current in each phase are not equal. As soon as current leaks to ground (fault condition) the current become imbalanced and a net magnetic field results. AG Series detectors monitor this field and trip alarm contacts when the leakage rises above the setpoint.

Solid-state Output Models

Sample Model Number: AG1-NOAC-120-NF-005
Ground fault detector with normally open solid-state contact output, 120 VAC power supply, 5 mA trip point.

Insulation Breakdown Monitoring

AG Series - Solid State Switch

AG Series - Mechanical Relay

Ground Fault Protection Dimensions

Solid - State

Mechanical