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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
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 blade contacts are
suited to the laminated contacts of the guide frame can be in-
serted 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
circuit 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 cover
The arc chute cover is available as optional equipment for
the guide frame. It protects switchgear components which
are located directly above the circuit breaker.
Door sealing frame and cover
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.
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