● Attach the transformer to the cable according to the orientation
of the K and L symbols, as shown in the figure.
● Securely fasten the clamp using the buckle.
● Use a crimp-on terminal for 0.75 mm
2
cables to connect the
secondary-stage cable.
● The wires of the secondary-stage cable are color-coded as
follows. k side=white; l side=black
Secure the current transformer and cable with a commercially
available cable tie as shown in the photo below.
CAUTION
When extending secondary-stage cable of the current
transformer, use a covered ring-sleeve or the like and
a cable of 1.25 to 2 mm². The standard cable length is
as follows.
When secondary-stage current is 5 A:
Up to 2.6 m for 1.25 mm², and up to 4.6 m for 2 mm²
When secondary-stage current is 1 A:
Up to 8.3 m for 1.25 mm², and up to 15 m for 2 mm²
5. DISPOSAL
These current transformers, when no longer serviceable, must be
disposed of as industrial refuse.
6. SPECIFICATIONS
6.1 General
The CTW series are clamp-on current transformers that can be
installed much easier than conventional current transformers,
whereby saving labor. These transformers are particularly useful
when expanding existing system since you can attach them to a
cable without having to cut it.
6.2
Characteristic Specifications
Rated primary current (In) / Rated secondary current:
CTW10= 100A / 1A
CTW20= 200A / 1A
CTW100= 500A / 5A
CTW130= 800A / 5A
Rated frequency: 50 / 60 Hz
Rated burden:
CTW10, CTW20 = 0.5VA
CTW100, CTW130 = 2.5VA
Accuracy / Linearity: ±1.0% against rated primary current In
Phase difference: Within ±2° against rated primary current In
Operating circuit voltage: Within 500 V AC
Insulation resistance: 100 MΩ or more at 500 V DC (across core
and output)
Withstand voltage: 2000 V AC for one minute (across core and
output)
Operating temperature range: -20 to 50°C (no condensation)
Operating conditions: Indoor location
Weight:
CTW10= Approx. 220 g
CTW20= Approx. 220 g
CTW100= Approx. 350 g
CTW130= Approx. 380 g
7. EXTERNAL DIMENSIONS
7.1 CTW10 and CTW20
43
25
41
42
0.75mm
2
×300l-2C
K
L
Φ
70
Φ
24
7.2 CTW100 and CTW130
53
25
51
42
0.75mm
2
×300l-2C
Φ
90
Φ
36
K
L
2
IM 77C01W02-01E 1st Edition
Nov.29. 2019-00
