Operating Instructions
17
Model
I.D.
Rated Amps
Max. Amps
CTS-0750-yyy
0.75"
5, 15, 20, 30, 50, 70, 100, 150
200
CTS-1250-yyy
1.25"
70, 100, 150, 200, 250, 300, 400, 600
800
CTS-2000-yyy
2.00"
600, 800, 1000, 1200, 1500
2000
Table 6: Split-core CTs
Model
I.D.
Rated Amps
Max. Amps
CTT-0300-yyy
0.30"
5, 15, 20, 30
40
CTT-0500-yyy
0.50"
15, 20, 30, 50, 60
80
CTT-0750-yyy
0.75"
30, 50, 70, 100
130
CTT-1000-yyy
1.00"
50, 70, 100, 150, 200
260
CTT-1250-yyy
1.25"
70, 100, 150, 200, 250, 300, 400
520
Table 7: Toroidal CTs
Accuracy
The WattNode’s minimum accuracy is 0.45% of reading plus 0.05% of full-scale. The total system
accuracy is subject to CT accuracy.
The WattNode can measure power from 0.1% to 150% of full-scale power at reduced accuracy, which
provides extra range for occasional high loads. Due to their nonlinearity, however, the CTs may not
produce accurate readings at very low power levels, and may saturate at very high power levels.
Electrical
Power Consumption:
up to 3 watts
Maximum Operating Voltage Range:
80% to 120% of nominal
Operating Frequency Range:
48 to 62 Hz
Optoisolator Output:
Isolation:
2500 V
Collector–emitter breakdown voltage:
35 V
Maximum collector–emitter current:
50 mA
Output waveform (2.667Hz and 4.000Hz models):
square-wave, 50% duty cycle
Environmental
Temperature:
-30° to +60°C
Humidity:
5 to 90% RH (non-condensing)
Mechanical
Enclosure:
High impact, ABS plastic
Flame Resistance Rating:
94HB
Size:
143mm × 85mm × 32mm (5.63" × 3.34" × 1.25")
Connectors:
Euroblock style pluggable terminal blocks
Light gray:
22 to 12 AWG, 600 V
Black:
26 to 16 AWG, 300 V
