ETC A74-10

Current and Voltage Controls
Current Transformer, 3-Phase
Types A 74-10, A 74-11
• 3-phase current metering transformers
for use with current control relays
• Measuring ranges:
A 74-10 5:
0.5 5 AAC
A 74-10 20: 2 - 20 AAC
A 74-11 100: 10 - 100 AAC
A 74-11 500: 50 - 500 AAC
Product Description
Ordering Key
3-phase current transformer
measures on all three phases.
Output voltage proportional
Type
Input current
to measured amplitude of the
rms-value of the normal
phase current.
A 74-10 5
Type Selection
Input current
Type no.
5 AAC
20 AAC
100 AAC
500 AAC
A 74-10 5
A 74-10 20
A 74-11 100
A 74-11 500
Input Specifications
Current range
Max. current (continuously)
Max. overload current (t = 30 s)
Rated insulation voltage
Input-output
Overvoltage category
Dielectric strength
Dielectric voltage
Rated impulse withstand volt.
A 74-10 5
A 74-10 20
A 74-11 100
A 74-11 500
0.5 - 5 AAC
20 AAC
40 AAC
2 - 20 AAC
50 AAC
85 AAC
10 - 100 AAC
250 AAC
325 AAC
50 - 500 AAC
750 AAC
1000 AAC
1000 VACrms
IV (IEC 60664)
1000 VACrms
IV (IEC 60664)
1000 VACrms
IV (IEC 60664)
1000 VACrms
IV (IEC 60664)
6 kVACrms
12 kV (1.2/50 µs)
6 kVACrms
12 kV (1.2/50 µs)
6 kVACrms
12 kV (1.2/50 µs)
6 kVACrms
12 kV (1.2/50 µs)
< 0.1 [email protected] A
< 0.25 [email protected] A
< 1.5 [email protected] A
< 21 [email protected] A
A 74-10 5
A 74-10 20
A 74-11 100
A 74-11 500
0.4 - 4 Vp
0.4 - 4 Vp
0.4 - 4 Vp
0.4 - 4 Vp
< 700 Ω
< 200 Ω
< 40 Ω
< 10 Ω
± 5%
± 5%
± 5%
± 5%
± 0.1% per °C
± 0.1% per °C
± 0.1% per °C
± 0.1% per °C
250 VACrms
250 VACrms
250 VACrms
250 VACrms
Power consumption
Output Specifications
Output voltage
(TA = 20°C = 68°F), RL = 9.5 kΩ)
Output impedance
Tolerance of output voltage
@ rated input current
Temperature variation
Rated insulation voltage (cable)
Specifications are subject to change without notice (19.07.06)
1
A 74-10, A 74-11
General Specifications
Mode of Operation
Pollution degree
Ambient temperature
Housing
A74-10
Dimensions
A74-11
Material
Weight
A 74-10
A 74-11
Connection cable
Approval
CE Marking
The current metering transformer is connected to the
current control relays H 475
as follows:
ductor through the hole several times makes it possible to
meter currents below the nominal range.
Red core to term. 5
White core to term. 6
Yellow core to term. 7
Black core to term. 8.
(starpoint - neutral).
If the conductor is drawn
through the central hole e.g. 5
times, the metering transformer will register 50 A when
the current in the conductor is
10 A.
3 (IEC 60664)
- 20 to + 60°C (- 4 to + 140°F)
120 x 45 x 16 mm
150 x 114 x 23
ABS
200 g
750 g
2 m PVC, 4 x 0.4 mm2
UL
Yes
- U1.
- U2.
- U3.
The metered conductor is
drawn through the central
hole of the current metering
transformer. Drawing the con-
In amplitude and phase the
output voltage is proportional
to the phase current metered.
Wiring Diagrams
Input current
Output voltage
Correct connection
U1 Red
Black
U3 Yellow
U2 White
Incorrect connection
U1 Red
Red
White
Yellow
Black
U2 White
Black
U3 Yellow
Dimensions
A 74-10 ..
2
A 74-11 ..
Specifications are subject to change without notice (19.07.06)