3WL Air Circuit Breakers
11
Siemens · 2012
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
General data
Rated current coding unit between circuit breaker and guide
frame
Withdrawable circuit breakers and guide frames are equipped
with a rated current coding unit as standard.
This ensures that only circuit breakers whose penetration blades
are suited to the laminated contacts of the guide frame can be
inserted into a guide frame (see diagram below).
Rated current coding unit between circuit breaker and guide frame
Equipment-dependent coding
Withdrawable circuit breakers and guide frames can be retrofit-
ted with an equipment-dependent coding unit.
This allows different designs of circuit breakers and guide
frames to be uniquely assigned. If the circuit breaker and guide
frame have been assigned different codes, the circuit breaker
cannot be inserted.
36 different coding options can be selected.
Position signaling switches for guide frames
The guide frame can be equipped with position signaling
switches. These can be used to determine the position of the cir-
cuit breaker in the guide frame.
Two versions are available:
•Option 1
Connected position 1 CO contact,
Test position 1 CO contact,
Disconnected position 1 CO contact;
•Option 2
Connected position 3 CO contacts,
Test position 2 CO contacts,
Disconnected position 1 CO contact.
Positions of the withdrawable circuit breaker in the guide frame
Phase barriers
The plant engineering company can manufacture phase barriers
made of insulating material for the arcing fault barriers. The rear
panel of the fixed-mounted circuit breakers or guide frames are
equipped with guide grooves.
Arc chute covers
The arc chute cover is available as accessory for the guide
frame. It protects switchgear components which are located di-
rectly above the circuit breaker.
Door sealing frame and cover
3WL circuit breakers have degree of protection IP20 as stan-
dard. However, if the switchgear is to be equipped with a higher
degree of protection, a door sealing frame with IP41 and a cover
with IP55 are available.
( 1 )
( 3 )
( 2 )
N S E 0 _ 0 1 0 3 1 a
( 4 )
( 5 )
N S E 0 _ 0 1 0 3 2 a
(1) Guide frame, interior of l/h side; interior of r/h side similar
(2) Coding pin on racking rail in guide frame
(3) Racking rail
(4) Withdrawable circuit breaker, r/h side; l/h side similar
(5) Coding pin on guide frame
presenting Position indicator Main circuit Auxiliary circuit Control cabinet
door
Shutters
Maintenance position Disconnected Disconnected Open Closed
Disconnected position Disconnected Disconnected Closed Closed
Test position Disconnected Connected Closed Closed
Connected position Connected Connected Closed Open
(1) Auxiliary circuit (2) Main circuit (3) Control cabinet door (4) Shutter
N S E 0 _ 0 1 0 3 3 a
( 1 )
( 2 )
( 4 )
CONNECT
TEST
DISCON
NSE01037
N S E 0 _ 0 1 0 3 4 a
( 3 )
CONNECT
TEST
DISCON
NSE01038
CONNECT
TEST
DISCON
NSE01039
CONNECT
TEST
DISCON
NSE01040
© Siemens AG 2011
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