
864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06
29/214
Description
12.2
Current transformers
Features
• According to IEC 60044-1
• Designed as ring-core current transformers:
- Ring core as carrier of secondary winding
- Main circuit corresponds to primary winding
• Arranged outside the primary enclosure (switchgear vessel) due to single-pole design
of the panel
• Free of dielectrically stressed cast-resin parts
Mounting locations
• On the busbar
• On the circuit-breaker housing
• On the panel connection
• On the cable
Electrical data
Fig. 13:
Current transformer installation (basic scheme)
①
Busbar current transformer (type 4MC4_40)
③
Feeder current transformer (type 4MC4_40)
②
Feeder current transformer (type 4MC4_90)
④
Feeder current transformer (type 4MC4_10)
Designation
Type 4MC4
Operating voltage
max. 800 V
Rated short-duration power- frequency withstand voltage
(winding test)
3 kV
Rated frequency
50/60 Hz
Rated continuous thermal current
max. 1.2 x rated current (primary)
Rated thermal short-time current, max. 3 s
max. 40 kA
Rated current
dynamic
unlimited
primary
40 A to 2500 A
secondary
1 A And 5 A
Multiratio (secondary)
200 A - 100 A to 2500 A - 1250 A
Core data according to rated primary current
max. 3 cores
Measuring core
Rating
2.5 VA to 30 VA
Class
0.2 to 1
Overcurrent factor
FS 5, FS 10
Protection core
Rating
2.5 VA to 30 VA
Class
5 P or 10 P
Overcurrent factor
10 to 30
Permissible ambient air temperature
max. 60 °C
Insulation class
E