Quiet Electronics Moderated Newsgroup For The Electronic Professionals and Other Professionals > Mississippi
> Used
> Nk technologies ground fault sensor ag series
Nk technologies ground fault sensor ag series
NK Technologies Ground Fault Sensor
AG’ Series sensors from NK Technologies protect people, products and processes from ground faults by monitoring all current-carrying wires in grounded single or 3-phase systems.
Operating Principle: Under normal conditions, the current in the hot leg of a two-wire load is equal in strength but opposite in sign to the current in the neutral leg. These two currents create magnetic fields that are also equal but opposite. When the wires are next to each other, the fields cancel, producing a "Zero Sum Current". If any current leaks to ground from one wire (Ground Fault), the two currents become imbalanced and the result is a net magnetic flux or field. AG Series ground fault sensors monitor this field and alarm when leakage rises above setpoint. This concept applies to grounded 3-phase delta and wye systems.
* Operation to Match Your Application:
Latching — For controlling contactors. Auto-Reset — For controlling shunt trip breakers.
* Setpoint Options to Match Your Needs:
Tri-Set —Field select 5, 10 or 30mA. Fast and convenient. (AG3 only)
Single-Set —Factory adjusted setpoint. Specify 5–100mA (AG1) or 80–950mA (AG2) when ordering.
* Compatible with Standard Equipment
Works on 1F or 3F power. Controls standard shunt trip breakers or contactors. Tie into Emergency Circuits (EMO/EPO).
Magnetically isolated from the monitored circuit and control power
* Personnel Protection (typically 5mA)
Senses low fault currents and alarms to shut power before injury occurs.
* Equipment Protection (typically 30mA)
When personal protection is not an issue, select a higher setpoint to protect equipment or product.
Factory adjusted and sealed (field adjustment possible)
• AG1: 5–100mA, specify when ordering
• AG2: 80–950mA, specify when ordering
Isolated dry contact (solid state or relay, see Ordering Information)
• Solid State AC Switch: 1A @ 240VAC
• Solid State DC Switch: 0.15A 30VDC
Up to 1,250VAC (monitored circuit)
0.75" (19mm) dia., up to 4" (100mm) dia. available, consult factory.
• 120, 200, 208, 220, 240VAC, 50-400Hz, operates from 55–110% of nominal voltage
• 24VAC & 24VDC, operates +/–10%
• Green LED = power (all models)
5 to 158°F (–15 to 70°C), 0-95% RH, non-condensing
UL 1053, Class 1 Recognized, CE*
*Most option combinations are UL recognized.
Output Table (Solid State Output Models)
Normally Energized Models (–FS Option solid state output)
Protection from faults and loss of control power.
Normally De-energized Models (–NF Option solid state output)
Protection from faults only when control power is applied.
Normally Energized Models (–ENE Option relay output)
Protection from faults and loss of control power.
Normally De-energized Models (–DEN Option relay output)
Protection from faults only when control power is applied.
Latching models initially power up in the Reset position. If there is a fault or the test button is pressed, the output switches and is latched. The output will remain latched after the fault is cleared, even if control power is removed. To reset the output, apply a momentary contact across the "Reset" terminals (5–6).
RGCS Ultra fast, residual current sensor
This is a new sensor, developed so the OEM user can achieve UL943A recognition of their control panels. This sensor trips so fast, that it can be used with most circuit breakers, and the total latency time to trip will be shorter that UL requires. The sensor will have to be tested with each circuit breaker individually. Please contact the factory for more information.
