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Description
2.8 Basic unit
If used with an external protection relay with a maximum delay time of 500 ms, the
switch disconnector has a breaking capacity at the maximum rated operational voltage
(U
) that corresponds to the value of the one-second rated short-time current (I
e
"non-automatic air circuit breaker" is sometimes also called a load interrupter switch because
it can switch overcurrents.
3WL10 non-automatic air circuit breakers
3WL10 non-automatic air circuit breakers are only available in classes N and S.
Number of poles
Rated operational
voltage
Rated insulation
voltage
Rated impulse
withstand voltage
Isolating features
Current-carrying capacity of the
neutral pole for 4-pole non-auto‐
matic
circuit breakers
Breaking capacity
Rated uninterrupted current
(at 40 °C)
Rated short-circuit
making capacity up to 690 V
Rated short-time
withstand current
Utilization category
(according to IEC 60947-3)
Rated conditional
short-circuit current
up to 690 V
3VA27 non-automatic air circuit breakers
The 3VA27 non-automatic air circuit breaker is offered in class M.
Number of poles
Conventional thermal current
Rated operational current
Rated operational voltage
38
U
AC (50/60 Hz)
e
U
AC (50/60 Hz)
i
U
imp
I
AC (50/60 Hz)
u
I
AC (50/60 Hz)
u
I
AC (50/60 Hz)
u
I
AC (50/60 Hz)
u
I
disconnector only
cm
with upstream ACB air
circuit breaker
I
1 s
cw
I
3 s
cw
I
cc
I
th
AC22
I
e
AC23
I
e
U
AC (50-60 Hz) V
e
DC
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
V
V
kV
IEC 60947-3
% I
n
N
A
630
A
800
A
1000
A
1250
kA
88
kA
145
kA
42
kA
24
AC-23A
kA
42
3, 4
A
800
1000
A
800
1000
A
800
1000
690
V
750
). The
cw
3, 4
690
1000
12
100
S
630
800
1000
1250
105
145
50
36
AC-23A
50
1250
1600
1250
1600
1250
1250
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