Siemens SENTRON 3WL10 Manual page 42
Air circuit breaker
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Also See for SENTRON 3WL10:
- Equipment manual (272 pages) ,
- Manual (234 pages) ,
- Manual (60 pages)
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Description
2.7 Basic unit
Switch disconnectors
Switch disconnectors are devices that meet the insulation requirements of the standard IEC
60947-3 and IEC 60947-2 CBI-Y Annex L.
The switch disconnector has an identical design to the circuit breaker and has the same
dimensions, weights, and optional accessories. However, it differs from the circuit breaker in
that it does not have any protection functions and therefore no electronic trip unit (ETU) and
no internal electronics or current transformer.
The disconnector ensures an insulation clearance between its main contacts in the open
state that isolates all downstream parts of the installation.
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
corresponds to the value of the one-second rated short-time current (I
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-
automatic
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
40
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
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
) that
e
). The "non-
cw
3, 4
V
690
V
1000
kV
12
IEC 60947-3
% I
100
n
N
A
630
A
800
A
1000
1000
A
1250
1250
kA
88
kA
145
kA
42
kA
24
AC-23A
AC-23A
kA
42
Manual, 10/2018, L1V30499596002-01
S
630
800
105
145
50
36
50
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