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Description
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Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
Integrated varistor
The integrated varistor limits overvoltages to approx. 500 V for
• protection devices (when inductive components are mounted in the vacuum circuit-
breaker)
• auxiliary voltages ≥ 60 V DC
17.3
Endurance classes
The switching devices of 8DA10 switchgear conform to the classes according to
IEC 62 271-100 and -102.
Overview
Circuit-breaker
Three-position
disconnector
Make-proof earthing
switch
NOTICE
Overvoltages in inductive circuits
Electrical control devices can be damaged by switching overvoltages.
➭ Do not switch off inductive consumers in DC circuits.
Panel type
Circuit-breaker
Disconnector
Earthing switch
Circuit-breaker panel
M2
M1
E2
1
1
By closing the circuit-breaker
E2
C2
Bus sectionalizer panel
M2
M1
E2
1
E2
C2
Disconnector panel
M1
E0
Function
Class
Standard
Property
BREAKING
M2
IEC 62271-100
10000 times mechanically
M2 (extended version)
30000 times mechanically with maintenance
E2
IEC 62271-100
10000 times rated normal current
50 times short-circuit breaking current
C2
IEC 62271-100
Very low probability of restrikes
Function
Class
Standard
Property
DISCONNECTING
M1
IEC 62271-102
2000 times mechanically
M1 (extended version)
3000 times mechanically
READY-TO-EARTH
1000 times mechanically
EARTHING
E2
1
1
By closing the circuit-breaker
IEC 62271-102
5 times rated short-circuit making current I
ma
Function
Class
Standard
Property
EARTHING
E1
IEC 62271-102
1000 times mechanically
2 times rated short-circuit making current I
ma