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Technologies Main Selection Page 
AC and DC Current Switches 
AS1 Series, SingleRange AC Current Switch 
AS1 DODC
Series, Current Switch with Dual Output 
AS3 Series, MultiRange AC Current Operated Switches 
ASM Series,
SelfCalibrating AC Current Switches 
ASX Series, AC Current Switches with Time Delay 
ASXP Series,
Powered AC Current Switches with Time Delay 
AS0 Series, Low Range AC Current Operated Switches 
DS3 Series, DC
Current Operated Switches 
AC and DC Current
Transducers 
AT Series, AC Current Transducers, Average Responding 
ATR Series, AC
Current Transducers, True RMS 
AT/ATR 3 & 4 Series, High Current AC Transducers 
ATP Series, Powered
AC Current Transducers 
ATP/ATPR 3 & 4 Series, Powered AC Current Transducers, True
RMS 
DT Series, DC Current
Transducers 
Ground Fault / Earth Leakage
Sensors 
AG Series, Ground Fault/Earth Leakage Sensors  SolidState
Relay Output 
AG Series, Ground
Fault/Earth Leakage Sensors  Mechanical Relay Output 
AGL Series, Large Aperture Ground Fault
Sensors 







AC and DC Current Switches 
Current
switches:
A broad range of AC and DC current sensing devices with a
variety of AC and DC contacts. Available with fixed and adjustable setpoints
for underload and overload detection. 














AC and DC Current Transducers 
Selecting the
right transducer:
VFD and SCR output waveforms are rough approximations
of a sine wave. There are numerous spikes and dips in each cycle. ATR
transducers use a mathematical algorithm called "True RMS," which integrates
the actual waveform over time. The output is the amperage component of the true
power (heating value) of the AC current waveform. True RMS is the only way to
accurately measure distorted AC waveforms. Select ATR transducers for nonlinear
loads or in "noisy" power environments.
The current waveform of a
typical linear load is a pure sine wave. AT transducers measure the peaks of
these sine waves, then calculate the average amperage. This works well on
constant speed linear loads in a "clean" power environment. Select AT
transducers for strictly linear loads on "clean" power. 








Ground Fault / Earth Leakage Sensors 
Ground Fault
Sensors:
‘AG’ Series sensors from NK Technologies protect
people, products and processes from ground faults by monitoring all
currentcarrying wires in grounded single or 3phase systems.
Operating
Principle: Under normal conditions, the current in the hot leg of a twowire
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 conditions are normal, 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 3phase delta and wye systems.


