Modular units

PE56822
DE58404
PE57169
Generalities Ammeter
b At the leading edge of technology,
Amp 21D is suitable for Medium Voltage
network load management.
b Self-powered, it ensures a permanent
display of currents.
b Compact and in DIN format, it fi ts
naturally into MV cubicles.
b Cost effi cient, it uses the CT optimised
for Fault Passage Indicator.
b Performant, it displays phase current
and maximum of current.
Amp 21D
AMTED398078EN.indd
L1
L2
L3
The SM6 integrates ammeter Amp 21D on all
incoming cubicles and the fuse-switch cubicles
Functions
b Display of 3 phase current: I1 , I2 , I3. Range: 3 A to 800 A
b Display of 3 phase current maximeter: I1 , I2 , I3. Range: 3 to 800 A.
Display principle
b Load curents are permanently displayed
v continuous scrolling of L1, then L2, then L3.
b Maximeter
v access to maximeter display by pressing a dedicated push button
v continuous scrolling of M1, then M2, then M3
v reset of all maximeter by pressing a combination of two push buttons.
Assembly
Small size enclosure
b DIN format : 93 x 45 mm
b Secured, extraction-proof mounting
b Terminal connections.
Technical data
Application
Frequency 50 Hz and 60 Hz
Load current
Measurement
Minimum current > 3 A
Range Phase current 3 to 800 A
Accuracy (I < 630 A) ± 5%, ± 2 A
Reset of maximeter
Power supply
Manual from device Yes
Self power From the current sensors I load > 3 A
Battery No
Auxiliary supply
Display
No
Display 4 digits LCD
Current per phase Yes (resolution 1 A)
Sensors
Maximeter per phase Yes
Miscellaneous
Phase CTs 3 split core CT
Test Yes
Characteristics
Dielectric IEC 60255-5
Electromagnetic IEC 61000-4-4 (level 4)
IEC 61000-4-12
Climatic Operating temperature
Storage temperature
Salt fog
Mechanical IEC 60068-2-6
IEC 60068-2-29
Insulation 10 kV
Shock wave 20 kV
– 25°C to + 70°C
– 40°C to + 85°C
200 h
Vibrations 10 to 500 Hz: 2 g
Protection IP23
35