Akd-6-Akr-30/30H, Akr-50/50H/T50H, Akr-75/75H, Akr-100; Akd-8-Akr-30/30H/30L, Akr-50/50H/T50H, Akr-75/75H, Akr-100, Akr125 - ABB AKD-5 Installation Manual

AKD-6—AKR-30/30H, AKR-50/50H/T50H, AKR-75/75H, AKR-100
AKD-6 was manufactured in Salisbury, NC from 1977 to 1981. Some AKD-5s, which were built in Salisbury from 1975
until 1977, got name-plated as AKD-6. There is no "flash-butt" welded aluminum to copper. Aluminum bus is tin-
plated and bolted at shipping splits (but welded everywhere else) . Copper bus design has ring silver plating at bolted
joints. AKR-75 / 100s were introduced during this time. Stab-and-finger connections on 3200A and 4000A breakers
were improvements, versus the round the primary disconnects on the AKD-5. The 4000A breaker was also narrowed
to same width and phase-phase spacing as the 3200A.
The AKD-6 uses inner-house drawout breaker compartments on the 800—2000A breaker compartments. They are
painted ANSI 61 light gray and breakers have ECS or SST trip units.
AKD-6 should mark a shift away from all AK breakers and to AKR breakers. The AKR-30/50/50H/T50 breakers used in
AKD6 have a shallow 1" steel front escutcheon are drawout letter code "A" i.e. AKR-4A-30 and will be replaced by an
EntelliGuard R with a catalog number beginning with R2. The AKR-30/50/50H/T50/75/100 breakers sold to OEMs for
their switchgear have a 5" deep plastic front escutcheon & spring loaded sliding "picture frame". These are draw out
letter code "B" i.e. AKR-4B-30 which will be replaced by an EntelliGuard R with a catalog # beginning with R5 up to
2000A frame size and R6 for 3200 & 4000A frame sizes.
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 and will be replaced by EntelliGuard R with catalog # beginning with R2.
AKD-8—AKR-30/30H/30L, AKR-50/50H/T50H, AKR-75/75H, AKR-100, AKR125
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 trip units. 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. EntelliGuard R breakers with a catalog
number beginning with R3 replace an AKR-30/50/50H/T50 breaker with vertical lower stud & fingers. EntelliGuard R
breakers with a catalog number beginning with R6 replace an AKR-30/50/50H/T50 breaker with horizontal lower
stud & fingers.
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 AKD-8 breakers have a drawout letter code "D".
OEM versions are drawout letter code "B" and 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 cooling fan. It was release in 1995. None of the retrofill breakers utilize fans.
EntelliGuard R breakers with a catalog number beginning with R3 replace and AKR-75/100/125 breakers in AKD-8
switchgear. EntelliGuard R breakers with a catalog number beginning with R6 replace and AKR-75/100/125
breakers in OEM switchgear or switchboards or Switchboard which all utilize an OEM substructure mounted on a
shelf. The R6 breakers will require a different door with a "bump inward" as the original compartment depth is 1.4"
greater than AKD-8.
9 EntelliGuard R Circuit Breaker Retrofill AKD-5/6 Installation Manual DEH0005240 R01