Checklist For Replacing 3Wl With 3Wa Circuit Breaker According To Iec 61439-2 - Siemens SENTRON 3WA1 Manual

CubicleBUS
The functionality of the 3WA circuit breaker can be increased by integrated CubicleBUS
modules, e.g. communication and input/output modules. If the modules are integrated in
the circuit breaker, the height of the circuit breaker increases by 23 mm.
Remedy:
The CubicleBUS
Mounting adapter for CubicleBUS² modules (Page 384). With this solution, a 3WA circuit
breaker has the same height as a 3WL circuit breaker.
Note
Existing CubicleBUS modules of the 3WL circuit breaker must be replaced with
3WA CubicleBUS
The 3WL CubicleBUS and 3WA CubicleBUS
7.4.2.4

Checklist for replacing 3WL with 3WA circuit breaker according to IEC 61439-2

Integration of the 3WA circuit breaker instead of the 3WL circuit breaker is possible
without testing provided the following criteria are fulfilled:
• The rated current does not change.
• The rated short-time withstand current I
not change.
• All the points in the following checklist can be answered with "Yes".
The power distribution equipment is referred to as the reference design in the checklist.
No.
1
2
3
4
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
modules
2
modules can also be positioned externally on a DIN rail, see Chapter
2
modules.
2
Factors to be considered
Is the rated value for the short-circuit strength of each circuit of the
switchgear and controlgear assembly to be tested less than or equal to that
of the reference design?
Are the cross-section dimensions of the busbars and the connections of
each circuit of the switchgear and controlgear assembly to be tested greater
than or equal to those of the reference design?
Are the centerline spacings of the busbars and the connections of each
circuit of the switchgear assembly to be tested greater than or equal to
those of the reference design?
Are the busbar holders of each circuit of the switchgear and controlgear
assembly to be tested of the same type, of the same form and of the same
material as the reference design? Do they have the same or a smaller
centerline spacing over the length of the busbar as the reference design?
Does the support structure for the busbar holder have the same design and
mechanical strength?
Integration in power distribution equipment
7.4 Requirement according to IEC 61439
modules are not compatible.
2
of the power distribution equipment does
cw
2
Answer for
3WA
instead of
3WL
Yes
Yes
Yes
Yes
535