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7.3
Derating in the power distribution equipment
7.3.1
Overview
The following tables provide information about the rating of the 3WA circuit breaker
within the power distribution equipment. The data presented here is a summary of
computer simulations and tests actually performed. They represent guide values for both
fixed-mounted and withdrawable breakers.
Note
The derating specifications are not a replacement for an integration test according to
IEC 61439.
The derating values were determined within the following constraints:
• Minimal conductor cross-section of copper busbars, as specified in the 3WA catalog
• Control panels with internal separation according to shape 4
• Installed power loss of 100 W provided for auxiliary and control components in the
control panel
If copper busbars with a greater cross-section or control panels with internal separation
up to shape 2b are used, the derating values improve significantly.
7.3.2
Derating 3WA11
The following tables show the derating for size 1, installed in a control panel.
Note
The 3WA11 2500 A circuit breaker is currently (status in 2022) not yet integrated in the
Siemens power distribution equipment. The derating values are therefore not yet
available for installation of the size 1 3WA circuit breaker 2500 A in the power
distribution equipment.
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
Integration in power distribution equipment
7.3 Derating in the power distribution equipment
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