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Siemens · 10/2014
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
Introduction
■
Benefits
Low space requirements
The 3WL air circuit breakers require very little space. Size I
devices (up to 2000 A) fit into a 400 mm wide switchgear panel.
Size III devices (up to 6300 A) are the smallest of their kind and
with their construction width of 704 mm fit into an 800 mm wide
switchgear panel.
Modular design
Components such as auxiliary releases, motorized operating
mechanisms, overcurrent releases, current transformers,
auxiliary circuit signaling switches, automatic reset devices,
interlocks and engagement operating mechanisms can all be
exchanged or retrofitted at a later stage, thus allowing the circuit
breaker to be adapted to new, changing requirements.
The main contact elements can all be replaced in order to
increase the endurance of the circuit breaker.
Retrofittable modules for overcurrent release
Modularity is one of the main features of the new 3WL air circuit
breakers.
Special LCDs, ground-fault modules, rating plugs and
communication modules for the overcurrent releases are
available for fast and easy retrofitting and adaptation to
changing requirements.
Communication/metering functions
The use of modern communication-capable circuit breakers
opens up completely new possibilities in terms of start-up,
parameterization, diagnostics, maintenance and operation.
This allows many different ways of reducing costs and improv-
ing productivity in industrial plants, buildings and infrastructure
projects:
• Fast and reliable parameterization
• Timely information and response can prevent plant stoppages
• Effective diagnostics management
• Measured values are the basis for efficient load management,
for drawing up power demand profiles and for allocating
power to cost centers
• Preventive maintenance reduces the risk of expensive plant
downtimes
• Metering function with a very wide range of measured values,
such as current, voltage, energy, power etc.
• Can be used in 690 V networks
■
Application
• As incoming-feeder, distribution, coupling, and outgoing-
feeder circuit breakers in electrical installations
• For switching and protecting motors, capacitors, generators,
transformers, busbars and cables
When connected to an electronic I&C system, the air circuit
breakers offer a wide range of options for monitoring network
events.
Air circuit breakers belong to the SENTRON product family of
protection, switching, measuring and monitoring devices and
can be used in applications between 16 A and 6300 A.
The AC devices are available as circuit breakers and non-
automatic air circuit breakers. DC devices are only available
as non-automatic air circuit breakers.
Standards
3WL circuit breakers comply with:
• IEC 60947-2
• IEC 60947-2 Appendix F / CISPR 11/22 Class B
• Climate-proof according to IEC 60068-2-30.
Versions with UL 489 also available, see Catalog LV 16.
Conductor cross-sections
1)
ETU76B with graphics display can be used up to max. 55 °C.
2)
At breaking capacity H: 1600 A up to 70 °C.
3)
With rear vertical connections
4)
Size II, 3-pole, in fixed-mounted version
5)
Minimum main conductor cross-sections for 4-pole withdrawable circuit
breakers: 4 × 120 mm × 10 mm
Size III
Type Up to
3WL11 10 3WL11 12 3WL11 16 3WL11 20 3WL12 08 3WL12 10 3WL12 12 3WL12 16 3WL12 20
Permissible load
for withdrawable
versions
at rear horizontal
main connections
• Up to 55 °C (Cu bare)
• Up to 60 °C
(Cu bare)
1)
• Up to 70 °C
(Cu painted black)
1)
A
A
A
1000
1000
1000
1250
1250
1210
1600
1600
1490
2)
2000
1930
1780
800
800
800
1000
1000
1000
1250
1250
1250
1600
1600
1600
2000
2000
2000
Main conductor
minimum
cross-sections
• Copper bars,
bare
• Copper bars,
painted black
Unit(s)
mm
2
Unit(s)
mm
2
1 ×
60 × 10
1 ×
60 × 10
2 ×
40 × 10
2 ×
40 × 10
2 ×
50 × 10
2 ×
50 × 10
3 ×
50 × 10
3 ×
50 × 10
1 ×
50 × 10
1 ×
50 × 10
1 ×
60 × 10
1 ×
60 × 10
2 ×
40 × 10
2 ×
40 × 10
2 ×
50 × 10
2 ×
50 × 10
3 ×
50 × 10
3 ×
50 × 10
Size II III
Type 3WL12 25 3WL12 32 3WL12 40
3)
3WL13 40 3WL13 50 3WL13 63
3)
Permissible load
for withdrawable
versions at rear
horizontal main
connections
• Up to 55 °C (Cu bare)
• Up to 60 °C
(Cu bare)
1)
• Up to 70 °C
(Cu painted black)
1)
A
A
A
2500
2500
2280
3200
3020
2870
3950
4)
3810
3600
4000
4000
4000
5000
5000
5000
5920
5810
5500
Main conductor
minimum
cross-sections
• Copper bars,
bare
• Copper bars,
painted black
Unit(s)
mm
2
Unit(s)
mm
2
2 ×
100 × 10
2 ×
100 × 10
3 ×
100 × 10
3 ×
100 × 10
4 ×
120 × 10
4 ×
100 × 10
5)
4 x
100 x 10
4 ×
100 × 10
6 x
100 x 10
6 ×
100 × 10
6 x
120 x 10
6 ×
120 × 10
© Siemens AG 2015
