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4-20 mA Output Analog Current Sensors
NSA-4-20-ANALOG

Part Numbers

NSA-A/CTA2-250
NSA-A/CTA2-5
NSA-A/CTA2-50
NSA-A/SCTA2-50-RMS

The 4-20 mA Output Analog Current Sensors are designed for use in any AC current monitoring application in which you are looking to monitor a particular piece of equipment. The “Average” style current sensors should be used in applications where the Sinusoidal waveform has no distortion or noise on the conductor being monitored. Applications may include monitoring a resistive type load such as an incandescent light bulb, heating element as well as any single speed linear load. Note that the “True RMS” sensors are able to be used in all applications since the “True RMS” current sensors provide the best overall accuracy and should be used in applications which includes Variable Frequency Drives, Switching Power Supplies, Computers and Data Centers, Electronic Ballasts, SCR’s, and Variable Speed Loads.

Applications

Load Trending, Basic Power Monitoring, Electronic Ballasts, Computers/Data Centers, Industrial, Variable Speed Loads, Pumps, Compressors, Fans, Preventative Maintenance, LEED, Project Justification (ROI) Process Control, Solid State Environments (SCR’s)

Monitored Current Type: AC Current
Maximum AC Voltage: 600 VAC
Isolation Voltage: 2200 VAC
Operating Frequency Range1: NSA-A/CTA2 Series: 40 to 1KHz | NSA-A/SCTA2-50 RMS: 15 to 100 Hz
Core Style: NSA-A/CTA2 Series: Solid | NSA-A/SCTA2-50 RMS: Split
Supply Voltage: +8.5 to 30 VDC (Reverse Polarity Protected)
250 Ohm Load (1-5 VDC): +13.5 to 30 VDC
500 Ohm Load (2-10 VDC): +18.5 to 30 VDC
Maximum Load Resistance @ 24 VDC: 775 Ohms (Formula: (24 VDC – 8.5 VDC) / 0.020A )
Supply Current: 25 mA minimum
Selectable Range: NSA-A/CTA2-5: 0 to 5A | NSA-A/CTA2-250: 0 to 100/200/250A
NSA-A/CTA2-50: 0 to 10/20/50A | NSA-A/SCTA2-50-RMS: 0 to 10/20/50A
Output Signal | Maximum Output Signal: 4 to 20 mA (2-Wire, Loop Powered) | Limited to 25 mA
Accuracy2: All Models: +/- 1% of Selected Range except NSA-A/SCTA2-50-RMS: +/- 2% from 15 to 20 Hz, +/- 1% from 20 to 100 Hz
Response Time: NSA-A/CTA2-xxx: < 600 mS (Rise and Fall Time)
NSA-A/SCTA2-50-RMS: 600 mS (Rise Time) and 2800 mS (Fall Time)
Aperture Size: 0.75” (19.05 mm)
Din Rail Size: 35 mm (U.S. Patent No. 7,416,421)
Operating Temperature Range: 5 to 104ºF (-15 to 40ºC)
Operating Humidity Range: 0 to 95%, non-condensing
Storage Temperature | RH Range: 41 to 95°F (5 to 35°C) | 40% to 85% RH, non-condensing
Enclosure Material | Flammability Rating: PC/ABS (Polycarbonate/ABS Blend) | UL94-V0
Wiring Connections: 2 Position, Screw Terminal Block (Polarity Sensitive)
Wire Recommendations: 2 Conductor (Shielded Cable)
Wire Size: 18 to 24 AWG (0.823 mm to 0.205 mm) Copper Wires only
Terminal Block Torque Rating: 4.43 to 5.31 in-lbs. (0.5 to 0.6 Nm)
Minimum Mounting Distance: 1” (2.6 cm) between current sensor & other magnetic
Agency Approvals: CE (-RMS Versions): CE to IEC 61326-1: 2012 Class A, UL/CUL US Listed (UL 508) Ind. Control Equipment | (File # E309723), RoHS2, WEEE
Product Weight: NSA-A/CTA2-xxx: 0.260 lbs (0.118 kg)
NSA-A/SCTA2-xxx-RMS: 0.190 lbs (0.087 kg)
Product Dimensions: Solid Core Versions: 2.760” (70.11 mm) x 3.343” (84.92 mm) x 1.050” (26.67 mm)
Split Core Versions: 2.780” (70.51 mm) x 3.238” (82.25 mm) x 1.120” (28.45 mm)

1Only the 0 to 100 Amp range in the NSA-A/CTA2-250-RMS will meet accuracy specifications from 15 to 100 Hz
2All current output sensors are calibrated at an ambient room temperature of 71ºF (21.5ºC)

Monitored Current Type: AC Current
Maximum AC Voltage: 600 VAC
Isolation Voltage: 2200 VAC
Operating Frequency Range1: NSA-A/CTA2 Series: 40 to 1KHz | NSA-A/SCTA2-50 RMS: 15 to 100 Hz
Core Style: NSA-A/CTA2 Series: Solid | NSA-A/SCTA2-50 RMS: Split
Supply Voltage: +8.5 to 30 VDC (Reverse Polarity Protected)
250 Ohm Load (1-5 VDC): +13.5 to 30 VDC
500 Ohm Load (2-10 VDC): +18.5 to 30 VDC
Maximum Load Resistance @ 24 VDC: 775 Ohms (Formula: (24 VDC – 8.5 VDC) / 0.020A )
Supply Current: 25 mA minimum
Selectable Range: NSA-A/CTA2-5: 0 to 5A | NSA-A/CTA2-250: 0 to 100/200/250A
NSA-A/CTA2-50: 0 to 10/20/50A | NSA-A/SCTA2-50-RMS: 0 to 10/20/50A
Output Signal | Maximum Output Signal: 4 to 20 mA (2-Wire, Loop Powered) | Limited to 25 mA
Accuracy2: All Models: +/- 1% of Selected Range except NSA-A/SCTA2-50-RMS: +/- 2% from 15 to 20 Hz, +/- 1% from 20 to 100 Hz
Response Time: NSA-A/CTA2-xxx: < 600 mS (Rise and Fall Time)
NSA-A/SCTA2-50-RMS: 600 mS (Rise Time) and 2800 mS (Fall Time)
Aperture Size: 0.75” (19.05 mm)
Din Rail Size: 35 mm (U.S. Patent No. 7,416,421)
Operating Temperature Range: 5 to 104ºF (-15 to 40ºC)
Operating Humidity Range: 0 to 95%, non-condensing
Storage Temperature | RH Range: 41 to 95°F (5 to 35°C) | 40% to 85% RH, non-condensing
Enclosure Material | Flammability Rating: PC/ABS (Polycarbonate/ABS Blend) | UL94-V0
Wiring Connections: 2 Position, Screw Terminal Block (Polarity Sensitive)
Wire Recommendations: 2 Conductor (Shielded Cable)
Wire Size: 18 to 24 AWG (0.823 mm to 0.205 mm) Copper Wires only
Terminal Block Torque Rating: 4.43 to 5.31 in-lbs. (0.5 to 0.6 Nm)
Minimum Mounting Distance: 1” (2.6 cm) between current sensor & other magnetic
Agency Approvals: CE (-RMS Versions): CE to IEC 61326-1: 2012 Class A, UL/CUL US Listed (UL 508) Ind. Control Equipment | (File # E309723), RoHS2, WEEE
Product Weight: NSA-A/CTA2-xxx: 0.260 lbs (0.118 kg)
NSA-A/SCTA2-xxx-RMS: 0.190 lbs (0.087 kg)
Product Dimensions: Solid Core Versions: 2.760” (70.11 mm) x 3.343” (84.92 mm) x 1.050” (26.67 mm)
Split Core Versions: 2.780” (70.51 mm) x 3.238” (82.25 mm) x 1.120” (28.45 mm)

1Only the 0 to 100 Amp range in the NSA-A/CTA2-250-RMS will meet accuracy specifications from 15 to 100 Hz
2All current output sensors are calibrated at an ambient room temperature of 71ºF (21.5ºC)

California residents please see Proposition 65