Siemens SENTRON 3WL Reference Manual page 13

3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
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).
( 1 )
( 2 )
( 3 )
(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
Rated current coding unit between circuit breaker and guide frame
Positions of the withdrawable circuit breaker in the guide frame
Display
Maintenance position
( 1 )
Disconnected position
( 3 )
Test position
Connected position
N S E 0
(1) Auxiliary circuit (2) Main circuit
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 cover
The arc chute cover is available as optional equipment for the
guide frame. It protects switchgear components which are loca-
ted directly above the circuit breaker.
( 4 )
( 5 )
Position indicator
( 2 )
CONNECT
TEST
( 4 )
DISCON
N S E 0 _ 0 1 0 3 3 a
NSE01037
CONNECT
TEST
DISCON
N S E 0 _ 0 1 0 3 4 a
NSE01038
CONNECT
TEST
DISCON
N S E 0 _ 0 1 0 3 5 a
NSE01039
CONNECT
TEST
DISCON
0 1 0 3 6 a
NSE01040
(3) Control cabinet door (4) Shutter
3WL Air Circuit Breakers
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 fra-
mes 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 indicator switch for guide frames
The guide frame can be equipped with position indicator swit-
ches. These can be used to determine the position of the circuit
breaker in the guide frame.
Two versions are available:
• Option 1
Connected position
test position
disconnected position 1 CO contact.
• Option 2
Connected position
test position
disconnected position 1 CO contact.
Main circuit Auxiliary circuit
Disconnected Disconnected
Disconnected Disconnected
Disconnected Connected
Connected Connected
Door sealing frame and cover
SENTRON 3WL circuit breakers have degree of protection IP20
as standard. 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.
General data
1 CO contact,
1 CO contact,
3 CO contacts,
2 CO contacts,
Control cabinet Shutters
door
Open Closed
Closed Closed
Closed Closed
Closed Open
Siemens · 2009 13