Siemens SENTRON 3WL10, Manual

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Description
2.3 Basic unit
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
27
3WL10 switch disconnector
Switch disconnectors are devices that meet the insulation requirements of the standard
IEC 60947-3.
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
e
) that
corresponds to the value of the one-second rated short-time current (I
cw
). The non-automatic
air circuit breaker is sometimes also called a load interrupter switch because it can switch
overcurrents.
3WL10 non-automatic air circuit breakers are only available in classes N and S.
Number of poles 3, 4
Rated operational voltage U
e
AC (50/60 Hz) V 690
Rated insulation voltage U
i
AC (50/60 Hz) V 1000
Rated impulse withstand
voltage
U
imp
kV 12
Isolating features IEC 60947-3
Current-carrying capacity of
the neutral pole for 4-pole
non-automatic circuit breakers
% I
n
100
Breaking capacity N S
Rated uninterrupted current
(at 40 °C)
I
u
AC (50/60 Hz) A 630 630
I
u
AC (50/60 Hz) A 800 800
I
u
AC (50/60 Hz) A 1000 1000
I
u
AC (50/60 Hz) A 1250 1250
Rated short-circuit making
capacity
I
cm
400 - 415 V AC kA 88 105
I
cm
440 V AC kA 88 105
I
cm
50 - 5250 V AC kA 88 105
I
cm
690 V AC kA 88 105
Rated short-time withstand
current
I
cw
1 s kA 42 50
I
cw
3 s kA 24 36
Utilization category
(according to IEC 60947-3)
AC-23A AC-23A
Rated conditional short-circuit
current up to 690 V
I
cc
kA 42 50