J.H. Larson Company
Acme Buck-Boost Transformer Selection Chart 120x240 Volts Primary–16/32 Volts Secondary

Three Phase		BOOSTING					BUCKING
Line Voltage (Available)		183Y 106	208Y 120	195	208	225	240	245	250	256	265	272
Load Voltage (Output)		208	236	208	240	240	208	230	234	240	234	240
Quanity Required		3	3	2	2	2	2	2	2	2	2	2
Catalog Number	Connection  Diagram	A–A	A–A	G–G	B–B	G–G	D–D	C–C	C–C	C–C	E–E	E–E
T-1-81054 0.05 KVA	KVA Amps Fuse/Breaker	1.13 3.13 6	1.28 3.13 6	1.13 3.13 6	0.63 1.56 3	1.30 3.13 6	0.56 1.56 3	1.33 3.33 6	1.35 3.34 6	1.39 3.33 6	0.72 1.77 3	0.74 1.77 3
T-1-81055 0.10 KVA	KVA Amps Fuse/Breaker	2.25 6.25 15	2.55 6.25 15	2.25 6.25 15	1.27 3.13 6	2.60 6.25 15	1.13 3.13 6	2.65 6.66 15	2.71 6.68 15	2.77 6.67 15	1.43 3.54 6	1.47 3.54 6
T-1-81056 0.15 KVA	KVA Amps Fuse/Breaker	3.38 9.38 15	3.38 9.38 15	3.38 9.38 15	1.90 4.69 10	3.90 9.38 15	1.69 4.69 10	3.98 9.99 15	4.06 10.02 15	4.16 10.00 15	2.15 5.31 10	2.21 5.31 10
T-1-81057 0.25 KVA	KVA Amps Fuse/Breaker	5.63 15.63 25	6.39 15.63 25	5.63 15.63 25	3.17 7.81 15	6.50 15.63 25	2.81 7.81 15	6.63 16.64 20	6.77 16.69 20	6.93 16.67 20	3.59 8.85 15	3.68 8.85 15
T-1-81058 0.50 KVA	KVA Amps Fuse/Breaker	11.26 31.25 45	12.77 31.25 45	11.26 31.25 45	6.33 15.63 25	12.99 31.25 45	5.63 15.63 20	13.26 33.29 40	13.53 33.39 40	13.86 33.33 40	7.17 17.69 20	7.36 17.71 20
T-1-81059 0.75 KVA	KVA Amps Fuse/Breaker	16.89 46.88 70	19.16 46.88 70	16.89 46.88 70	9.50 23.44 35	19.49 46.88 70	8.44 23.44 30	19.89 49.93 60	20.30 50.08 60	20.78 50.00 60	10.76 26.54 30	11.04 26.56 30
T-1-81059 0.75 KVA	KVA Amps Fuse/Breaker	16.89 46.88 70	19.16 46.88 70	16.89 46.88 70	9.50 23.44 35	19.49 46.88 70	8.44 23.44 30	19.89 49.93 60	20.30 50.08 60	20.78 50.00 60	10.76 26.54 30	11.04 26.56 30
T-1-13073 1.00 KVA	KVA Amps Fuse/Breaker	22.52 62.50 90	25.55 62.50 90	22.52 62.50 90	12.67 31.25 45	25.98 62.50 90	11.26 31.25 35	26.52 66.58 80	27.06 66.67 80	27.71 66.67 80	14.34 35.39 40	14.72 35.42 40
T-1-13074 1.50 KVA	KVA Amps Fuse/Breaker	33.77 93.75 150	38.32 93.75 150	33.77 93.75 125	19.00 46.88 70	38.97 93.75 125	16.89 46.88 60	39.87 99.86 125	40.59 100.16 125	41.57 100.00 125	21.52 53.08 60	22.08 53.13 60
T-1-13075 2.00 KVA	KVA Amps Fuse/Breaker	45.03 125.00 200	51.10 125.00 200	45.03 125.00 175	25.33 62.50 90	51.96 125.00 175	22.52 62.50 70	53.04 133.15 175	54.13 133.55 175	55.43 133.33 175	28.69 70.78 80	29.44 70.83 80
T-1-13076 3.00 KVA	KVA Amps Fuse/Breaker	67.55 187.50 300	76.64 187.50 300	67.55 187.50 250	38.00 93.75 150	77.94 187.50 250	33.77 93.75 110	79.57 199.73 250	81.19 200.32 250	83.14 200.00 250	43.03 106.17 125	44.17 106.25 125
T-1-13077 5.00 KVA	KVA Amps Fuse/Breaker	112.58 312.50 450	127.74 312.50 450	112.58 312.50 450	63.33 156.25 225	129.90 312.50 450	55.29 156.25 175	132.61 332.88 400	135.32 333.87 400	138.56 333.33 400	71.72 176.95 200	73.50 176.80 200
T-1-13078[1] 7.50 KVA	KVA Amps Fuse/Breaker	166.87 468.75 700	191.61 468.75 700	168.87 468.75 700	94.99 234.38 350	194.86 468.75 700	84.44 234.38 300	198.92 499.32 600	202.97 500.80 600	207.85 500.00 600	107.58 265.42 300	110.42 265.63 300
T-1-13079[1] 10.00 KVA	KVA Amps Fuse/Breaker	225.17 625.00 1000	255.48 625.00 1000	225.17 625.00 1000	126.66 312.50 450	259.81 625.00 1000	112.58 312.50 350	265.22 665.76 800	270.63 667.74 800	277.13 666.67 800	143.44 353.90 400	147.22 354.17 400
Quanity Required		3	3	2	2	2	2	2	2	2	2	2
Catalog Number	Connection  Diagram	A–A	A–A	G–G	B–B	G–G	D–D	C–C	C–C	C–C	E–E	E–E

Note:	Inputs and outputs may be reversed; KVA remains constant. All applications in black are suitable for 50/60 Hz.   All applications in red are suitable for 60 Hz. only.
[1]	It is necessary to utilize multiple conductors on the secondary (X1, X2, X3, and X4) terminals of these transformers.

Selection Charts  120x240V - 12/24V 1Ø Phase  120x240V - 12/24V 3Ø Phase  120x240V - 16/32V 1Ø Phase  240x480V - 24/48V 1Ø Phase  240x480V - 24/48V 3Ø Phase

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