Siemens SENTRON 3WA1 - Page 538

Integration in power distribution equipment
7.4 Requirement according to IEC 61439
3WA1 air circuit breaker
536 Equipment Manual, 02/2023, 92310000002-06
No.
Factors to be considered
Answer for
3WA
instead of
3WL
5
Are the materials and the material properties of the conductors of each
circuit of the switchgear and controlgear assembly to be tested the same as
those of the reference design?
Yes
6
Are the short-circuit protection devices of each circuit of the switchgear and
controlgear assembly to be tested equivalent, i.e. same manufacturer and
same series
1)
with the same or better current-limiting properties (I
2
t, I
pk
)
based on information from the device manufacturer, and is their
arrangement identical to that of the reference design?
Yes
7
Is the length of the unprotected active conductors according to standard
IEC 61439-2 of each unprotected circuit of the switchgear and controlgear
assembly to be tested less than or equal to that of the reference design?
Yes
8
Switchgear and controlgear assembly with enclosure to be tested: Does the
reference design also take an enclosure into account during verification
testing?
Yes
2)
9
Is the enclosure of the switchgear and controlgear assembly to be tested
identical in design and type to that of the reference design? Are its
dimensions at least the same?
Yes
2)
10
Is the compartment of each circuit of the switchgear and controlgear
assembly to be tested identical to the mechanical design of the reference
design? Are their dimensions at least the same?
Yes
2)
1)
Short-circuit protective devices from the same manufacturer, but from a different series may
be regarded as equivalent if the device manufacturer confirms that the behavioral properties
are the same or better in every relevant respect as those of the series used for verification
(e.g. breaking capacity, current-limiting properties (I
2
t, I
pk
) and critical spacings).
2)
The circuit breaker requires no changes provided the rated current and breaking capacity
remain the same.
• If you can answer "Yes" to all the points in the checklist, you can replace the 3WL
circuit breaker with a 3WA circuit breaker without any further verification.
• If you answer "No" to one or more of the points in the checklist, you must provide
further verification with respect to the integrity of the power distribution equipment in
order to replace the 3WL circuit breaker with a 3WA circuit breaker.
Note
Observe the instructions for partitions in Chapter Phase barriers and horizontal partitions
(Page
537).