12
CTB series current transformer
6. Technical data
ATTENTION
In addition to the following technical data, pay particu-
lar attention to the information on the rating plate of
your device!
6.1 General technical data
Input
Primary rated current I
pr
(type-dependent)
Thermal
rated continuous current I
cth
1.2 x I
pr
(> 2000 A: 1.0 x I
pr
)
Thermal
rated short-time current I
th
60 x I
pr
/ 1 s
(max. 100 kA)
Rated surge current I
dyn
2.5 x I
th
Rated frequency f
R
50 ... 60 Hz
Tab. Technical data - Input
Output
Secondary rated current I
sr
5 A
Accuracy class
1
Rated power S
r
(type-dependent)
Overcurrent limiting factor F
S
FS5 or FS10
Tab. Technical data - Output
Operating conditions
Ambient temperature
-5 … +50 °C
(23 ... 122 °F)
Storage temperature
-25 … +70 °C
(-13 ... 158 °F)
Relative humidity (non-condens-
ing)
5 … 85%
Operating elevation
Up to 1000 m
(1093.61 yd)
Tab. Technical data - Operating conditions
Isolation properties
Rated isolation level U
m
in accordance with IEC 61010-1
under the following conditions:
- Overvoltage category III
- Pollution degree 2
- Heterogeneous electrical field
1.2 / 6 / - kV
Surge voltage strength in
accordance with
DIN EN 61439-1:2012-06
12 kV (1.2/50 μs)
Insulation class
E
Tab. Technical data - Isolation properties
Safety
Protection level
IP20
Housing material
PC
UL housing classification of
these types
UL94-V0
Overcurrent limiting factor F
S
FS5 or FS10
Tab. Technical data - Safety
Connection
Primary conductor feedthrough
Connection technology, second-
ary
CAGE CLAMP
®
Connection cross section, sec-
ondary
2.5 - 4 mm² /
AWG 14-12
Strip length
9 - 10 mm
(0.35 - 0.39 in)
Tab. Technical data - Connection
The latest edition of the aforementioned documents,
including all amendments, applies.
Standards complied with
·IEC 61869-1
·IEC 61869-2
·IEC 61010-1
Tab. Technical data - Standards complied with
