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B u c k - B o o s t T r a n s f o r m e r s
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H4
H1
H3
H2
X4
X1
X3
X2
INPUT
OUTPUT
1
2
3
1
2
3
H4
H3
H2
H1
X4
X3
X2
X1
TRANS. #1
TRANS. #2
INPUT ONLY
OUTPUT ONLY
1
2
3
1
2
3
H4
H3
H2
H1
X4
X3
X2
X1
H3 H2
H1
X4
X3 X2 X1
H4
H3
H2
H1
X4
X3
X2
X1
TRANS. #1
TRANS. #2
TRANS. #3
NEUTRAL
H4
H1
H3
H2
X4
X1
X3
X2
INPUT
OUTPUT
3
2 1
1
3
H4
H3
H2
H1
X4
X3
X2
X1
TRANS. #2
TRANS. #1
FIG. EE OPEN DELTA FIG. FF WYE FIG. GG OPEN DELTA
① The symbol O used in these
connection diagrams indicates
where to field install the
over-current protective device,
typically a fuse or circuit breaker.
② Cannot be reverse connected.
IMPORTANT: Refer to the N.E.C.
(National Electrical Code) Article
450-4 for overcurrent protection
of an autotransformer. These
connection diagrams are packed
with each buck-boost transformer.
Do not use connections other
than those shown above.
240 PRIMARY VOLTS — 208 SECONDARY VOLTS
kVA Catalog Number Height
(Inches)(Cm.)
Width
(Inches)(Cm.)
Depth
(Inches)(Cm.)
Weight
(Lbs.)(Kg.) Dimensional Drawing
3 A3003K0310B 15.19(38.6) 13.50(34.3) 10.84(27.5) 120(54.0) D
6 A3006K0310B 15.19(38.6) 13.50(34.3) 10.84(27.5) 120(54.0) D
9 A3009K0310B 15.19(38.6) 13.50(34.3) 10.84(27.5) 130(58.5) D
15 A3015K0310B 15.19(38.6) 13.50(34.3) 10.84(27.5) 130(58.5) D
30 A3030K0310B 18.86(47.9) 20.30(51.6) 9.03(22.9) 250(112.5) I
45 A3045K0310B 18.86(47.9) 20.30(51.6) 9.03(22.9) 270(121.5) I
75 A3075K0310B 24.81(63.0) 27.13(68.9) 11.14(28.3) 400(180.0) I
112.5 A3112K0310B 24.81(63.0) 27.13(68.9) 11.14(28.3) 600(270.0) I
150 A3150K0310B 24.81(63.0) 27.13(68.9) 11.14(28.3) 650(292.5) I
CONNECTION DIAGRAM
THREE PHASE BUCK-BOOST
Buck Boost transformers are the ideal solution anytime a line voltage change in the 5-15% range is required in single phase or three
phase applications.
Until now, three phase applications required multiple separate single phase Buck Boost Transformers to be wired and mounted
together. Acme Electric’s NEW 3 Phase Auto Buck Boost Transformers remove the need for multiple separate units and provide
the same great electrical advantages standard Buck Boost Transformers offer in one simple and convenient package.
Acme Electric’s NEW 3 Phase Auto Buck Boost Transformers are the best economical solutions available for three phase appli-
cations, requiring only one transformer and reducing the overall footprint. Additionally, the transformers are assembled and prewired
at the factory, a considerable time and installation cost savings.
Acme Electric’s NEW 3 Phase Auto Buck Boost Transformers are UL Listed with a 10 year warranty and are currently being
offered in Type 3R enclosures.