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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
General data
Main circuit connections – connection types
Main circuit connections
All circuit breakers are equipped with horizontal main circuit
connections on the rear for up to 5000 A as standard (horizontal
connection to busbars). Exception: Circuit breakers of size II
with max. rated current 4000 A.
Circuit breakers with a max. rated current of 6300 A and circuit
breakers of the size II with a max. rated current of 4000 A are
equipped with vertical main circuit connections (for upright
busbars).
The following options are available, with all combinations
of top and bottom connections possible:
• Accessible from the front, single hole (for vertically installed
busbars)
• Accessible from the front, double hole (holes according to
DIN 43673) (for vertically installed busbars)
• At the rear, vertical (for vertically installed busbars)
• Connecting flange (for direct connection to guide frames
up to 4000 A)
Connection options for auxiliary circuit connections
Auxiliary circuit connections
The type of connection for the auxiliary switches depends on the
type of installation:
• Withdrawable version: The internal auxiliary switches are
connected to the male connector on the switch side. When
fully inserted, the connector makes a connection with the
sliding contact module (see the graphic "Guide Frame" in
"Design") in the guide frame. Various adapters can then be
used to complete the wiring (see the graphic "Connection
options for auxiliary circuit connections")
• Fixed-mounted version: In this case the auxiliary supply
connectors are engaged directly onto the circuit breaker.
The connectors are equipped with coding pins that prevent
them being mistakenly interchanged
Operator panel
The operator panel is designed to protrude from a cutout in the
door providing access to all control elements and displays with
the control cabinet door closed. The operator panels for all
circuit breakers (fixed-mounted/withdrawable versions,
3-/4-pole) are identical. The operator panel ensures degree
of protection IP41.
Safety and reliability
To protect the circuit breakers and system against unauthorized
switching and to protect the maintenance and operator person-
nel, the system contains many locking devices. Others can be
retrofitted.
Other safety features include:
• Infeed from above or below, as required
• Locking of the guide frame with the circuit breaker removed,
as standard
• Locking of the withdrawable circuit breaker against
movement, as standard
• High degree of protection with cover IP55
• Mechanical reclosing lockout after overload or short-circuit
tripping as standard
• The circuit breaker is always equipped with the required
number of auxiliary supply connectors
Standard version
3WL circuit breakers are equipped with the following features
as standard:
• Mechanical ON and OFF pushbutton
• Manual operating mechanism with mechanical closing
• Switching position indication
• Ready-to-close indicator
• Store status indicator
• Auxiliary switch 2 NO + 2 NC
• Rear horizontal main circuit connections for fixed-mounted
and withdrawable versions up to 5000 A,
and rear vertical main circuit connections for 6300 A
applications and size II with 4000 A
• For 4-pole circuit breakers, the fourth pole (N) is installed
on the left and is 100 % loadable with the rated current
• Contact erosion indicator for the main contacts
• Auxiliary circuit plug-in system with SIGUT screw terminals
Delivery inclusive of all auxiliary circuit connectors as per
internal equipment including coding device for the prevention
of incorrect installation of auxiliary supply connectors for fixed-
mounted circuit breakers
• Mechanical "tripped" indicator for electronic trip system
• Mechanical reclosing lockout after tripping operation
• Operator panel cannot be taken off with the circuit breaker
in the ON position
Additional features of the withdrawable version:
• Main contacts: Laminated receptacles in the guide frame,
blade contacts on the withdrawable circuit breaker
• Position indicator in the operator panel of the withdrawable
circuit breaker
• Captive manual crank handle for moving the withdrawable
circuit breaker
• Guide frame with guide rails for easy moving of the
withdrawable circuit breaker
• The withdrawable circuit breaker can be locked to prevent
it being pushed out of position
• The withdrawable circuit breaker cannot be moved when it
is in the ON position
• Coding of the rated current between the guide frame and
the withdrawable circuit breaker.
Standards
3WL circuit breakers comply with:
• IEC 60947-2
• Climate-proof according to IEC 60068-2-30
Versions acc. to UL 489 also available, see Catalog LV 16.
Further standards, see
www.siemens.com/lowvoltage/
product-support
or
www.siemens.com/lowvoltage/configurators.
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