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

Single Phase		BOOSTING								BUCKING
Line Voltage (Available)		95	100	105	208	215	215	220	225	135	240	240	245	250	255
Load Voltage (Output)		120	114	119	240	244	230	235	240	119	208	225	230	234	239
Catalog Number	Connection Diagram	D	C	C	H	H	G	G	G	F	I	E	E	E	E
T-1-81054 0.05 KVA	KVA Amps Fuse/Breaker	0.19 1.56 6	0.36 3.13 6	0.37 3.13 6	0.38 1.56 6	0.38 1.56 6	0.72 3.13 6	0.73 3.13 6	0.75 3.13 6	0.42 3.54 6	0.37 1.77 3	0.75 3.33 6	0.77 3.33 6	0.78 3.33 6	0.80 3.33 6
T-1-81055 0.10 KVA	KVA Amps Fuse/Breaker	0.38 3.13 10	0.71 6.25 15	0.74 6.25 6	0.75 3.13 6	0.76 3.13 15	1.44 6.25 15	1.47 6.25 15	1.50 6.25 15	0.84 7.08 15	0.74 3.54 6	1.50 6.67 15	1.53 6.67 15	1.56 6.67 15	1.59 6.67 15
T-1-81056 0.15 KVA	KVA Amps Fuse/Breaker	0.56 4.69 10	1.07 9.38 15	1.12 9.38 15	1.13 4.69 10	1.14 4.69 10	2.16 9.38 15	2.20 9.38 15	2.25 9.38 15	1.26 10.63 15	1.11 5.31 6	2.25 10.00 15	2.30 10.00 15	2.34 10.00 15	2.39 10.00 15
T-1-81057 0.25 KVA	KVA Amps Fuse/Breaker	0.94 7.81 15	1.78 15.63 15	1.86 15.63 25	1.88 7.81 15	1.91 7.81 15	3.59 15.63 25	3.67 15.63 25	3.75 15.63 25	2.11 17.71 20	1.84 8.85 15	3.75 16.67 20	3.83 16.67 20	3.90 16.67 20	3.98 16.67 20
T-1-81059 0.75 KVA	KVA Amps Fuse/Breaker	2.81 23.44 40	5.34 46.88 70	5.58 46.88 70	5.63 23.44 40	5.72 23.44 40	10.78 46.88 70	11.02 46.88 70	11.25 46.88 70	6.23 53.13 60	5.53 26.56 30	11.25 50.00 60	11.50 50.00 60	11.70 50.00 60	11.95 50.00 60
T-1-13073 1.00 KVA	KVA Amps Fuse/Breaker	3.75 31.25 50	7.13 62.50 90	7.44 62.50 90	7.50 31.25 50	7.63 31.25 50	14.38 62.50 90	14.69 62.50 90	15.00 62.50 90	8.43 70.83 80	7.37 35.42 40	15.00 66.67 80	15.33 66.67 80	15.60 66.67 80	15.93 66.67 80
T-1-13074 1.50 KVA	KVA Amps Fuse/Breaker	5.63 46.90 80	10.69 93.80 150	11.16 93.80 150	11.25 46.90 70	11.44 46.90 80	21.56 93.80 125	22.03 93.80 125	22.50 93.80 125	12.64 106.30 125	11.05 53.10 60	22.50 100.00 125	23.00 100.00 125	23.40 100.00 125	23.90 100.00 125
T-1-13075 2.00 KVA	KVA Amps Fuse/Breaker	7.50 62.50 100	14.25 125.00 200	14.88 125.00 200	15.00 62.50 90	15.25 62.50 90	28.75 125.00 175	29.38 125.00 175	30.00 125.00 175	16.86 141.70 175	14.73 70.80 80	30.00 133.30 175	30.67 133.30 175	31.20 133.30 175	31.87 133.30 175
T-1-13076 3.00 KVA	KVA Amps Fuse/Breaker	11.25 93.80 150	21.38 187.50 300	22.31 187.50 300	22.50 93.80 150	22.88 93.80 150	43.13 187.50 250	44.06 187.50 250	45.00 187.50 250	25.29 212.50 125	22.10 106.30 250	45.00 200.00 250	46.00 200.00 250	46.80 200.00 250	47.80 200.00 250
T-1-13077 5.00 KVA	KVA Amps Fuse/Breaker	18.75 156.30 250	35.63 312.50 450	37.19 312.50 450	37.50 156.30 225	38.13 156.30 225	71.88 312.50 450	73.44 312.50 450	75.00 312.50 450	42.15 354.20 400	36.83 177.10 200	75.00 333.30 400	76.67 333.30 400	78.00 333.30 400	79.67 333.30 400
T-1-13078[1] 7.50 KVA	KVA Amps Fuse/Breaker	28.10 234.40 400	53.40 468.80 700	55.80 468.80 700	56.30 234.40 350	57.20 234.40 350	107.80 468.80 700	110.20 468.80 700	112.50 468.80 700	63.20 531.30 600	55.30 265.60 300	112.50 500.00 600	115.00 500.00 600	117.00 500.00 600	119.50 500.00 600
T-1-13079[1] 10.00 KVA	KVA Amps Fuse/Breaker	37.50 312.50 500	71.30 625.00 1000	74.40 625.00 1000	75.00 312.50 450	76.30 312.50 450	143.80 625.00 1000	146.90 625.00 1000	150.00 625.00 1000	84.30 708.30 800	73.70 354.20 400	150.00 666.70 800	153.40 666.70 800	156.00 666.70 800	159.30 666.70 800
Catalog Number	Connection Diagram	D	C	C	H	H	G	G	G	F	I	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 3Ø Phase  240x480V - 24/48V 1Ø Phase  240x480V - 24/48V 3Ø Phase

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