NK Technologies AG1-NOR-24U-NF-015 Ground Fault Detector (Solid State Output)

The NK Technologies AG1-NOR-24U-NF-015 is a solid-state ground fault detector engineered to monitor current imbalances across all current-carrying conductors in grounded single- and three-phase delta or wye AC power systems. Operating from a 24 VAC/DC supply, the detector identifies leakage currents to ground and triggers a solid-state normally open output to control shunt trip breakers or contactors, preventing equipment damage and enhancing system safety.

– Technical Specifications

Electrical Characteristics
• Power supply: 24 VAC/DC
• Monitored circuit voltage: Up to 1,500 VAC
• Monitored circuit frequency: 50–400 Hz
• Setpoint: 15 mA (factory-calibrated; range 5–100 mA)
• Response time: 200 ms @ 5% above trip point; 100 ms @ 50% above setpoint; 15 ms @ 500% above setpoint
• Output: Solid-state, normally open switch; <10 µA off-state leakage
• Isolation voltage: UL listed to 1,270 VAC; tested to 5 kV
• Power consumption: 2.5 W

Physical & Environmental
• Dimensions: 2.5″H × 2.8″W × 1.5″D (64 × 71 × 38 mm)
• Sensing aperture: 0.75″ (19 mm) diameter
• Case material: UL94 V-0 flammability rated
• Operating temperature: −4 to 122°F (−20 to 50°C)
• Operating humidity: 0–95% RH, non-condensing

– Key Features

• Monitors all current-carrying conductors simultaneously for ground fault detection
• Screw terminals rated for 22–14 AWG copper wire; 4.5–7 in-lbs torque
• Surface mountable or suspended directly on wires with tie
• Latching models feature momentary dry-contact reset (terminals 5 & 6)
• Standard or optional noise immunity configurations available

– Typical Applications

Ideal for industrial and commercial electrical systems where ground fault protection is critical: machinery control circuits, motor protection, distribution systems, and hazardous location monitoring requiring fast fault detection and automatic circuit isolation.

– Compatibility & Integration

Designed for grounded AC power systems. Compatible with single- and three-phase configurations in both delta and wye topologies. Output relay rating: 30 VDC @ 2.0 A; 120 VAC @ 0.5 A.