ABB Emax 2 Installation And Maintenance Manual page 9

These are draw out letter code "B" i.e. AKR-4B-30.The AKR-75/100 breakers used in AKD-6
have a shallow 1" steel front escutcheon and vertical primary fingers. They are drawout letter
code"C" i.e. AKR-4C-75.
None of the Emax 2 Retrofill breakers utilize fans except for 4000A rating only.
AKD - 8 The AKD-8 was manufactured in Salisbury, NC from 1980 to 1984 and in Burlington, Iowa
from 1984 to 1999. It was mostly replaced by AKD-10 in 1999 to 2000 but was available thru
2015.
Model 1 and 2 have extruded vertical bus. Model 2 was introduced in 1983 to accommodate
revised wire harness routing. Model 3 was introduced in 1991, using a flat bar vertical bus.
AKR breakers use MicroVersaTrip 9, MVT RMS9, EPIC, MVT Plus, MVT PM or EntelliGuard TU.
Aluminum bus was removed from the design in 1996 in favor of the standard tin-plated
copper bus (silver plated optional).
The AKR-30/50/50H/T50 breakers used in AKD8 have 5" deep plastic front escutcheon&
spring loaded sliding "picture frame". They are drawout letter code "D" i.e. AKR-7D-30. In
AKD-8, most 800-2000A breakers are "feeder" breakers with vertical lower stud & primary
disconnect fingers clusters, but 800-2000A breakers designated as "Main" breakers, have
horizontal lower finger clusters, which is the same as "D" letter code breakers sold to OEM's.
A lower stud rejection bracket differentiates between lower stud orientations.
AKR-75/100/125 circuit breakers used in AKD-8 switchgear have a 5" deep plastic front
escutcheon & spring loaded sliding "picture frame" similar to the small frame breakers. The
positions DISC/TEST/CONN are shown on the side of the front escutcheon by position of
the sliding "picture frame". The GE AKD-8 breakers have a drawout letter code "D". OEM
versions are drawout letter code "B" and GE Switchboard versions are drawout letter code
"F". "B" & "F" breakers only differed by appearance items. All Primary disconnect stabs are
vertically oriented.
The AKR-125 is a 5000A breaker that had 2 cooling fans. It was release in 1995. None of the
Emax 2 Retrofill breakers utilize fans except for 4000A rating only.
AKD - 10 AKD-10 was manufactured in Burlington, IA from 1999 thru 2015. The switchgear
compartment sizes and main & vertical bus arrangements are the same as AKD-8 Model 3.
The compartments have pull-out rails. AKD-10 uses WavePro * drawout-only style breakers.
All breakers have 4 rollers which align with the compartment rails.
The secondary control wiring for all functions is connected thru either one or two 36 point
secondary disconnects with gold plated contacts. Secondary control wiring terminates at
fixed standard locations on the 36 point disconnects. Each breaker has a pump style manual
charging handle and manual push OPEN and Push CLOSE buttons. The front escutcheon is
5" deep with a sliding picture frame, but is wide enough so the trip unit and new style bell
alarm are visible thru the front door of the switchgear.
Note GE Switchboard plants initially shipped "WS" style breakers and later shifted to "WE"
style breakers to be consistent with GE Switchgear from Burlington, Iowa. The 5000A
breaker had cooling fans. None of the Emax 2 Retrofill breakers utilize fans except the 4000A
fully rated breaker.
(W1 & W2 Catalog numbers on legacy WavePro breakers designate additional dead front
shields)
2TSA451011P0000 Rev-B
© 2020 Emax 2 Retrofill Circuit Breakers 600A-4000A | 9