Integration in power distribution equipment
7.4 Requirement according to IEC 61439
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
529
7.4.2.3 Retrofit: Simple replaceability in existing power distribution equipment
Turning old into new
The term retrofit refers to modification of the electrical installation of existing power
distribution equipment whereby old devices are replaced with new devices at the end of
their service life. Please note: When a withdrawable circuit breaker is replaced at the
end of its service life, both the circuit breaker and the guide frame must be replaced.
Prerequisites for retrofit according to IEC 61439-1
A 3WL circuit breaker can be replaced by a 3WA circuit breaker according to IEC 61439
without any additional testing or structural changes if the 3WA is to be operated with the
same technical requirements as the 3WL.
The following criteria must be fulfilled in order to be able to replace the circuit breakers
in a retrofit procedure:
• Certification available with respect to compliance of power distribution equipment
with standards at the time of commissioning (e.g. according to DIN VDE 0660, Part
500)
• Assessment of possible change of use
• The rated and short-circuit currents of the system are not increased.
• Ambient conditions are not changed.
• The feed-in power is not increased (no photovoltaics, cogeneration units or electrical
energy stores are added).
If the prerequisites are fulfilled, the advantages are as follows:
• No modification (e.g. no change when connecting the door or copper bars)
• No EMC tests
• No temperature-rise tests
• No short-circuit tests
requirements defined according to IEC 61439-
1 must also be fulfilled here,
see Chapter Structural integration in power distribution equipment (Page
527).
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