03 POWER ELECTRONICS AND CABINET FEATURES
3BHS213401 E01 REV H ACS1000 AIR-COOLED USER MANUAL 49/184
3.8 Arc resistant design (optional)
The optional “Arc Resistant Design” provides the drive with arc fault protection in accordance
with IEC 62477-2.
The ABB arc resistant classes in Table 3-2 indicate the type of arc proofing that a drive uses.
Depending on the drive configuration, classes I and II are available for an ACS1000A.
Table 3-2: ABB arc resistant classes
3.8.1 Internal arc classification (IAC)
The arc fault rating, which is based on arc fault tests, is on the label underneath the drive rating
plate of the drive.
Figure 3-19: IAC label example
3.8.2 Associated protection requirement
The arc resistant design requires associated protections that are not included in the scope of
the delivery, ie, a main circuit breaker.
For information on the arc resistant design class of your drive, see the project-
specific “Converter Data Sheet” (Appendix B of the ACS1000A user manual).
ABB class Description
Class I Protection based on arc prevention (NOT certified according to IEC 62477-2)
Class II
Protection based on arc resistant cabinet structure
(1)
(1) IAC certified by 3rd body according to IEC 62477-2
Class III Protection based on external arc fault limitation and elimination. HV fuses
are applied externally to limit the arc fault current
(1)
Class IV
Fast arc detection and elimination
(1)
3BHB049908R1205
F L R T B APR SCI
ඉ
t
ඉ
2b
0.3 0.3 0.3 - -
2b 2b 1 1 5 kA 0.5 s Yes No
Distance [m]
Internal Arc Classification (IAC)
ABB Class II
For more information on the MCB:
- MCB overview: “2.8 Important note - main circuit breaker” on page 23
- MCB requirements: "Input circuit breaker engineering guideline" [5]
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