Specifications are subject to change without notice (28.10.99) 1
Current and Voltage Controls
• 1-phase current metering transformer for
use with control relays types:
S 178, S 180, S 1821, S 1822, SM 115, SY 115, H 479
• Measuring ranges:
MI 5: 0.5 - 5 AAC
MI 20: 2 - 20 AAC
MI 100: 10 - 100 AAC
MI 500: 50 - 500 AAC
Product Description
AC current transformers for
5, 20, 100, 500 AAC. Output
Ordering Key
Type
Input current
Type Selection
Input current Type no.
5 AAC MI 5
20 AAC MI 20
100 AAC MI 100
500 AAC MI 500
voltage (0.4 - 4 Vp) is propor-
tional to measured current.
Input Specifications
MI 5 MI 20 MI 100 MI 500
Current range 0.5 - 5 AAC 2 - 20 AAC 10 - 100 AAC 50 - 500 AAC
Max. current (continuously) 20 AAC 50 AAC 250 AAC 750 AAC
Max. overload current (t = 30 s)
40 AAC 85 AAC 325 AAC 1000 AAC
Rated insulation voltage
Input-output 1000 VACrms 1000 VACrms 1000 VACrms 1000 VACrms
Overvoltage category IV (IEC 60664) IV (IEC 60664) IV (IEC 60664) IV (IEC 60664)
Pollution degree 3 (IEC 60664) 3 (IEC 60664) 3 (IEC 60664) 3 (IEC 60664)
Dielectric strength
Dielectric voltage 6 kVACrms 6 kVACrms 6 kVACrms 6 kVACrms
Rated impulse withstand volt. 12 kV (1.2/50 µs) 12 kV (1.2/50 µs) 12 kV (1.2/50 µs) 12 kV (1.2/50 µs)
Power consumption < 100 mW/5 A < 100 mW/20 A < 0.5 W/100 A < 6 W/500 A
MI 5 MI 20 MI 100 MI 500
Voltage output
(TA= 20°C, RL= 9.5 kΩ) 0.4 - 4 Vp0.4 - 4 Vp0.4 - 4 Vp0.4 - 4 Vp
Output impedance < 700 Ω< 200 Ω< 40 Ω< 10 Ω
Tolerance of output voltage
@ rated input current ± 5% ± 5% ± 5% ± 5%
Temperature variation ± 0.1% per °C ± 0.1% per °C ± 0.1% per °C ± 0.1% per °C
Rated insulation voltage (cable)
250 VACrms 250 VACrms 250 VACrms 250 VACrms
Current Transformer, 1-Phase AC
Types MI 5, MI 20, MI 100, MI 500
Output Specifications
MI 500
2Specifications are subject to change without notice (28.10.99)
MI 5, MI 20, MI 100, MI 500
The metered conductor is
drawn through the central
hole of the current metering
transformer. Drawing the con-
ductor through the hole sev-
eral times makes it possible
to meter currents below the
nominal range.
If the conductor is drawn
through the central hole e.g. 5
times, the metering trans-
Mode of Operation
former will register 50 A when
the current in the conductor
is 10 A.
In amplitude and phase the
output voltage is proportional
to the phase current metered.
4 Vp will then be equal to
the rms-value of the nomi-nal
phase current.
General Specifications
Ambient temperature
- 20° to + 60°C (- 4° to + 140°F)
Connection cable 2 m PVC, 2 x 0.25 mm2
Weight MI 5, MI 20 70 g
MI 100, MI 500 270 g
Material/colour ABS, light grey
Approval UL
Power supply
S 178
Power supply
S 1822
Motor/generator
Latch/
hysteresis
black
black
Dimensions
MI 5, MI 20 MI 100, MI 500
Wiring Diagrams
