Rockwell Automation 825-P Modular Protection System for Motors User Manual - Manual (Page 191)

Rockwell Automation Publication 825-UM004D-EN-P - April 2012 191
Specifications Chapter A
Primary Current
Transformers
➊ Designation according to IEC 60044 part 2:
825-CBCT Core Balance
Current Transformer
Minimum Nominal Operating Voltage Nominal Operating Voltage of Motor
Minimum Rated Primary Current l
1n
Nominal Operating Current of Motor
Rated Secondary Current [A] 825-MCM2 825-MCM5 825-MCM20
1 25 5
Class and Nominal Overcurrent Protection 5P10 ext. 120% ➊
Power Rating According to power consumption in leads and measuring circuit.
Rated Frequency 50/60 Hz
Burden 825-MCM2 825-MCM5 825-MCM20
Power Consumption at Maximum Rated Current
[VA/phase] 0.1 0.2 0.4
Continuous Thermal Current [A] 3 6 24
Thermal Current, 1 s Duration [A] 250 400 600
No Load An open-circuit secondary is permitted, as the burden is provided
in the converter module circuitry.
5 Total Measurement Error (percentage): ± 5% within range up to rated nominal overcurrent
± 1% at rated nominal primary current
P For Protection Purposes
10 Rated Nominal Overcurrent Factor: 10X rated nominal primary current
ext.
120%
Extended Rated Thermal Current: 120% of rated nominal primary current (if l
e
motor > 87%
of rated nominal transformer current)
Ratio 100:1
Current Range 0.5...10 A
Continuous Thermal Current 0.5 A
Saturation Current 30 A
Thermal Current, 1 s Duration 25 A
Rated Burden at Maximum Rated Current 0.4 V A
Rated Frequency 50/60 Hz