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NGRM700_D00292_02_Q_XXEN/06.2018
Measuring current transformer connection
Depending on the system to be monitored, a suitable measuring current transformer has to be chosen.
All common measuring current transformers (50 mA or 5 A on the secondary side) can be used. The fol-
lowing table helps you with the choice:
CT installation W…AB
System type AC + DC AC AC
I 1…10 A 5…25 A 5…25 A
f 0…3800 Hz 42…3800 Hz 50/60 Hz
Ratio 600:1 600:1 60:5
Length
connecting cables
max. 10 m max. 40 m
max. 25 m (4 mm²)
max. 40 m (6 mm²)
I
Δn
Type
W35…120AB W20…120
W1-S35…W5-S210
CTB31…41
CT: k NGRM700: 50 mA NGRM700: 50 mA NGRM700: 5 A
CT: l NGRM700: C NGRM700: C NGRM700: C
k
l
W...AB
AN420
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