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Siemens · 10/2014
General data
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
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Design
Overview of 3WL circuit breakers/non-automatic air circuit breakers
Versions
• Rated currents: 630 A to 6300 A
• 3 sizes for different rated current ranges
(see illustration above)
• 3 and 4-pole versions
• Rated operational voltage up to 690 V AC and 1000 V DC.
Special versions up to 1000 V AC and 1150 V AC available
• 4 different breaking capacities from 55 kA to 150 kA for AC
applications and one breaking capacity for DC applications
The 3WL circuit breakers are supplied complete with
operating mechanism (manual operating mechanism with
mechanical closing), electronic trip unit and auxiliary switches
(2 NO contacts + 2 NC contacts in the standard version), and
can be equipped with auxiliary trip units.
Installation methods
Fixed-mounted or withdrawable versions.
Ambient temperatures
The 3WL circuit breakers are climate-proof according to
IEC 60068-2-30. They are intended for use in enclosed areas
where no severe operating conditions (e.g. dust, corrosive
vapors, damaging gases) are present.
When installed in dusty and damp areas, suitable enclosures
must be provided.
Coordinated dimensions
The dimensions of 3WL circuit breakers only differ in terms of the
width of the device which depends on the number of poles and
the size.
Due to the nature of the design, the dimensions of devices with
a withdrawable version are determined by the dimensions of the
guide frames, which are slightly larger.
Non-automatic air circuit breakers
One special version of circuit breaker is utilized as a non-auto-
matic air circuit breaker. The non-automatic air circuit breakers
are designed without an electronic trip system and do not per-
form any protection functions for the system.
One potential application is the use as a bus coupler in systems
with parallel feed-ins.
The versions and features can be selected according to those of
the circuit breakers.
Operating mechanisms
The circuit breakers are available with various optional
operating mechanisms:
• Manual operating mechanism with mechanical closing
(standard design)
• Manual operating mechanism with mechanical and electrical
closing
• Motorized operating mechanism with mechanical and
electrical closing
The operating mechanisms with electrical closing can be used
for synchronization tasks.
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