Buck Boost Transformers

Buck Boost Transformer Home
Links, Information & Listings
for types of Buck Boost Transformers. Access to wholesale pricing!

Buck Boost Transformer Installation
Details and further information regarding installation and basic configurations.

Three Phase Buck Boost Transformers
Fundamental data with links to listings of transformers used in 3 phase applications.

Low Voltage Applications
A basic description and links to transformers recommended for low voltage applications.

AC Line Reactors
Adjust, block or otherwise handle unwanted power characteristics often generated during normal use of power in an area. Not to be confused with the need for a Buck Boost or other type Transformer.

Federal Pacific Buck Boost Transformers
Quality transformers built in the USA.

Acme Buck Boost Transformers
A reliable leading American transformer distributing company.

Hammond Buck Boost Transformers
Originated as a family -owned and run company and is now a nation-wide distributor!

Jefferson Buck Boost Transformers
In business over 93 years; supplying a diverse selection of products to an equally diverse clientele.

Other Popular Voltage Transformers
Power transmission and distribution requires voltage and line characteristics to be altered and adjusted in several ways. Read up on what is generally available.

TEMCo Buck Boost Transformers
The fast-growing company that has taken a top niche in providing you with quality electrical transformers and power products.

TEMCo Capacitor for Motor
TEMCo offers a wide selection of start and run capacitors for your motor needs. Products are always in stock and are Shipped Fast from California, with delivery within 1 to 3 days.

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Buck Boost Transformers

◙ Buck Boost Transformer Installation  ◙ Three Phase Buck Boost Transformers  ◙ Low Voltage Applications  ◙ AC Line Reactors 
◙ Acme Buck Boost Transformers  ◙ Hammond Buck Boost Transformers 
◙ Jefferson Buck Boost Transformers  ◙ Other Popular Voltage Transformers  ◙ TEMCo Buck Boost Transformers

BUCK BOOST TRANSFORMERS

RESOURCE LINKS, TYPES & DESCRIPTIONS

Buck Boost Transformers were developed to supply voltages for two main categories; the first of which is when the local power is consistently not high or low enough to correctly and safely run the equipment at its rated power load.

For loads demanding slightly higher voltages than available a  Buck Boost Transformer can be designed such that the majority of the line load is passed directly through to the power source while only that amount of kVA needed to adjust to corrected specifications is actually added. This allows much smaller Buck Boost Transformers to service a significantly greater supply to a load than the kVA that is indicated on the transformer nameplate.

Common examples of this application of Buck Boost Transformers would be where motors and HVAC equipment is operating on a line supplying 110V or 230V when the equipment demands 120V or 240V service. A Buck Boost Transformer is designed to lower (buck) or raise (boost) line voltage in a range of 5% to 20%.

Buck Boost Transformers are also used when significantly lower voltages are needed, as in low voltage lighting and landscape lighting.

Primary voltages running from 110V to 440V are lowered to secondary voltages as low as 12 volts, but can also be 16, 24, 32 or 48 volts and can be configured by custom design to fit other voltages.

Buck-Boost Transformer Selection Chart 120 x 240 Volts Primary–12/24 Volts Secondary

Single Phase		BOOSTING								BUCKING
Line Voltage (Available)		96	100	105	109	189	208	218	220	125	132	229	245	250	252
Load Voltage (Output)		115	120	116	120	208	229	240	242	114	120	208	223	227	240
Click part # for info	Conn. Diag.	B	B	A	A	D	D	D	D	A	A	D	D	D	C
Federal SB12N.050F Acme T-1-81047 Hammond QC05ERCB	KVA Amps	0.24 2.08	0.25 2.08	0.48 4.17	0.50 4.17	0.43 2.08	0.48 2.08	0.50 2.08	0.50 2.08	0.52 4.58	0.55 4.58	0.48 2.29	0.51 2.29	0.52 2.29	1.05 4.38
Federal SB12N.100F Acme T-1-81048 Hammond QC10ERCB	KVA Amps	0.48 4.17	0.50 4.17	0.96 8.33	1.00 8.33	0.87 4.17	0.95 4.17	1.00 4.17	1.01 4.17	1.04 9.17	1.10 9.17	0.95 4.58	1.02 4.58	1.04 4.58	2.10 8.75
Federal SB12N.150F Acme T-1-81049 Hammond QC15ERCB	KVA Amps	0.72 6.25	0.75 6.25	1.44 12.50	1.50 12.50	1.30 6.25	1.43 6.25	1.50 6.25	1.51 6.25	1.56 13.75	1.65 13.75	1.43 6.87	1.53 6.87	1.56 6.87	3.15 13.13
Federal SB12N.250F Acme T-1-81050 Hammond QC25ERCB	KVA Amps	1.20 10.42	1.25 10.42	2.41 20.83	2.50 20.83	2.17 10.42	2.38 10.42	2.50 10.42	2.52 10.42	2.60 22.92	2.75 22.92	2.39 11.46	2.55 11.46	2.60 11.46	5.25 21.88
Federal SB12N.500F Acme T-1-81051 Hammond QC50ERCB	KVA Amps	2.40 20.83	2.50 20.83	4.81 41.67	5.00 41.67	4.33 20.83	4.77 20.83	5.00 20.83	5.04 20.83	5.21 45.83	5.50 45.83	4.77 22.92	5.10 22.92	5.21 22.92	10.50 43.75
Federal SB12N.750F Acme T-1-81052 Hammond QC75ERCB	KVA Amps	3.60 31.25	3.75 31.25	7.22 62.50	7.38 62.50	6.50 31.25	7.15 31.25	7.49 31.25	7.56 31.25	7.81 68.75	8.25 68.75	7.16 34.37	7.66 34.37	7.81 34.37	15.75 65.63
Federal SB12N1F Acme T-1-11683 Hammond Q1C0ERCB	KVA Amps	4.80 41.67	5.00 41.67	9.63 83.33	9.99 83.33	8.66 41.67	9.53 41.67	9.99 41.67	10.08 41.67	10.42 91.67	11.00 91.67	9.54 45.83	10.21 45.83	10.42 45.83	21.00 87.50
Federal SB12N1.5F Acme T-1-11684 Hammond Q1C5ERCF	KVA Amps	7.20 62.50	7.50 62.50	14.44 125.00	14.99 125.00	12.99 62.50	14.30 62.50	14.99 62.50	15.13 62.50	15.62 137.50	16.50 137.50	14.31 68.75	15.31 68.75	15.62 68.75	31.50 131.25
Federal SB12N2F Acme T-1-11685 Hammond Q002ERCF	KVA Amps	9.60 83.33	10.00 83.33	19.25 166.67	19.98 166.67	17.32 83.33	19.07 83.33	19.98 83.33	20.17 83.33	20.83 183.33	22.00 183.33	19.08 91.67	20.42 91.67	20.83 91.67	42.00 175.00
Federal SB12N3F Acme T-1-11686 Hammond Q003ERCF	KVA Amps	14.40 125.00	15.00 125.00	28.88 250.00	29.98 250.00	25.99 125.00	28.60 125.00	29.98 125.00	30.25 125.00	31.25 275.00	33.00 275.00	28.62 137.50	30.62 137.50	31.25 137.50	63.00 262.50
Federal SB12N5F Acme T-1-11687 Hammond Q005ERCF	KVA Amps	24.00 208.33	25.00 208.33	48.13 416.67	49.96 416.67	43.31 208.33	47.67 208.33	49.96 208.33	50.42 208.33	52.08 458.33	55.00 458.33	47.71 229.17	51.04 229.17	52.08 229.17	105.00 437.50
Click part # for info	Conn. Diag.	B	B	A	A	D	D	D	D	A	A	D	D	D	C

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Buck-Boost Transformer Selection Chart 120 x 240 Volts Primary–12/24 Volts Secondary

Three Phase		BOOSTING									BUCKING
Line Voltage (Available)		189Y 109	195Y 113	200Y 115	208Y 120	416Y 240	416Y 240	189	208	220	218	229	250	255	264
Load Voltage (Output)		208Y 120	234Y 135	240Y 139	229Y 132	458Y 264	437Y 252	208	229	242	208	208	227	232	240
Click part # for info	Conn. Diag.	F	E	E	F	J	K	G	G	G	H	G	G	G	G
Federal SB12N.050F Acme T-1-81047 Hammond QC05ERCB	KVA Amps	1.50 4.17	0.84 2.08	0.87 2.08	1.65 4.17	1.65 2.08	3.15 4.17	0.75 2.08	0.83 2.08	0.87 2.08	1.57 4.38	0.83 2.29	0.90 2.29	0.92 2.29	0.95 2.29
Federal SB12N.100F Acme T-1-81048 Hammond QC10ERCB	KVA Amps	3.00 8.33	1.69 4.17	1.73 4.17	3.30 8.33	3.30 4.17	6.30 8.33	1.50 4.17	1.65 4.17	1.75 4.17	3.15 8.75	1.65 4.58	1.80 4.58	1.84 4.58	1.91 4.58
Federal SB12N.150F Acme T-1-81049 Hammond QC15ERCB	KVA Amps	4.50 12.50	2.53 6.25	2.60 6.25	4.95 12.50	4.95 6.25	9.46 12.50	2.25 6.25	2.48 6.25	2.62 6.25	4.72 13.13	2.48 6.87	2.71 6.87	2.76 6.88	2.86 6.88
Federal SB12N.250F Acme T-1-81050 Hammond QC25ERCB	KVA Amps	7.50 20.83	4.22 10.42	4.33 1.42	8.26 20.83	8.26 10.42	15.76 10.42	3.75 10.42	4.13 10.42	4.37 10.42	7.87 21.88	4.13 11.46	4.51 11.46	4.60 11.46	4.76 11.46
Federal SB12N.500F Acme T-1-81051 Hammond QC50ERCB	KVA Amps	15.00 41.67	8.44 20.83	8.66 20.83	16.51 41.67	16.51 20.83	31.52 241.67	7.50 20.83	8.26 20.83	8.73 20.83	15.73 43.75	8.26 22.92	9.02 22.92	9.20 22.92	9.53 22.92
Federal SB12N.750F Acme T-1-81052 Hammond QC75ERCB	KVA Amps	22.51 62.50	12.67 31.25	12.99 31.25	24.77 62.50	24.77 31.25	47.28 62.50	11.25 31.25	12.38 31.25	13.10 31.25	23.60 65.63	12.39 34.37	13.53 34.37	13.80 34.37	14.29 34.38
Federal SB12N1F Acme T-1-11683 Hammond Q1C0ERCB	KVA Amps	30.01 83.33	16.89 41.67	17.32 41.67	33.02 83.33	33.02 41.67	63.05 83.33	15.00 41.67	16.51 41.67	17.46 41.67	31.47 87.50	16.53 45.83	18.04 45.83	18.40 45.83	19.05 45.83
Federal SB12N1.5F Acme T-1-11684 Hammond Q1C5ERCF	KVA Amps	45.01 125.00	25.33 62.50	25.98 62.50	49.54 125.00	49.54 62.50	94.57 125.00	22.51 62.50	24.77 62.50	26.20 62.50	47.20 131.25	24.79 68.75	27.06 68.75	27.60 68.75	28.58 68.75
Federal SB12N2F Acme T-1-11685 Hammond Q002ERCF	KVA Amps	60.02 166.67	33.77 83.33	34.64 83.33	66.05 166.67	66.05 83.33	126.09 166.67	30.01 83.33	33.02 83.33	34.93 83.33	62.93 175.00	33.05 91.67	36.08 91.67	36.81 91.67	38.11 91.67
Federal SB12N3F Acme T-1-11686 Hammond Q003ERCF	KVA Amps	90.02 250.00	50.66 125.00	51.96 125.00	99.07 250.00	99.07 125.00	189.14 250.00	45.01 125.00	49.54 125.00	52.39 125.00	94.40 262.50	49.58 137.50	54.13 137.50	55.21 137.50	57.16 137.50
Federal SB12N5F Acme T-1-11687 Hammond Q005ERCF	KVA Amps	150.04 416.67	84.44 208.33	86.60 208.33	165.12 416.67	165.12 208.33	315.23 416.67	75.02 208.33	82.56 208.33	87.32 208.33	157.33 437.50	82.63 229.17	90.21 229.17	92.02 229.17	95.26 229.17
No. of Transformers		3	3	3	3	3	3	2	2	2	2	2	2	2	2
Catalog Number	Conn. Diag.	F	E	E	F	J	K	G	G	G	H	G	G	G	G

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Buck-Boost Transformer Selection Chart 120 x 240 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	113	119	236	244	229	235	240	120	212	225	230	234	239
Click part # for info	Conn. Diag.	B	A	A	D	D	C	C	C	A	D	C	C	C	C
Federal SB16N.050F Acme T-1-81054 Hammond QC05ESCB	KVA Amps	0.19 1.56	0.35 3.13	0.37 3.13	0.37 1.56	0.38 1.56	0.72 3.12	0.73 3.13	0.75 3.12	0.42 3.54	0.38 1.77	0.75 3.33	0.77 3.33	0.78 3.33	0.80 3.33
Federal SB16N.100F Acme T-1-81055 Hammond QC10ESCB	KVA Amps	0.38 3.13	0.71 6.25	0.74 6.25	0.74 3.13	0.76 3.13	1.43 6.25	1.47 6.25	1.50 6.25	0.84 7.08	0.75 3.54	1.50 6.67	1.53 6.67	1.56 6.67	1.59 6.67
Federal SB16N.150F Acme T-1-81056 Hammond QC15ESCB	KVA Amps	0.56 4.69	1.06 9.38	1.12 9.38	1.11 4.69	1.14 4.69	2.15 9.37	2.20 9.37	2.25 9.37	1.27 10.63	1.13 5.31	2.25 10.00	2.30 10.00	2.34 10.00	2.39 10.00
Federal SB16N.250F Acme T-1-81057 Hammond QC25ESCB	KVA Amps	0.94 7.81	1.77 15.63	1.86 15.63	1.84 7.81	1.90 7.81	3.58 15.62	3.67 15.62	3.75 15.62	2.11 17.71	1.88 8.85	3.75 16.67	3.83 16.67	3.91 16.67	3.98 16.67
Federal SB16N.500F Acme T-1-81058 Hammond QC50ESCB	KVA Amps	1.88 15.63	3.54 31.25	3.72 31.25	3.68 15.63	3.81 15.63	7.17 31.25	7.33 31.25	7.50 31.25	4.22 35.42	3.75 17.71	7.50 33.33	7.66 33.33	7.81 33.33	7.97 33.33
Federal SB16N.750F Acme T-1-81059 Hammond QC75ESCB	KVA Amps	2.82 23.44	5.31 46.88	5.58 46.88	5.53 23.44	5.71 23.44	10.75 46.87	11.00 46.87	11.25 46.87	6.33 53.13	5.63 26.56	11.25 50.00	11.48 50.00	11.72 50.00	11.95 50.00
Federal SB16N1F Acme T-1-13073 Hammond Q1C0ESCB	KVA Amps	3.76 31.25	7.08 62.50	7.44 62.50	7.37 31.25	7.61 31.25	14.33 62.50	14.67 62.50	15.00 62.50	8.44 70.83	7.50 35.42	15.00 66.67	15.31 66.67	15.62 66.67	15.94 66.67
Federal SB16N1.5F Acme T-1-13074 Hammond Q1C5ESCF	KVA Amps	5.64 46.88	10.63 93.75	11.16 93.75	11.05 46.88	11.42 46.88	21.50 93.75	22.00 93.75	22.50 93.75	12.66 106.25	11.25 53.13	22.50 100.00	22.97 100.00	23.44 100.00	23.91 100.00
Federal SB16N2F Acme T-1-13075 Hammond Q002ESCF	KVA Amps	7.52 62.50	14.71 125.00	14.88 125.00	14.73 62.50	15.23 62.50	28.67 125.00	29.33 125.00	30.00 125.00	16.88 141.67	15.00 70.83	30.00 133.33	30.62 133.33	31.25 133.33	31.87 133.33
Federal SB16N3F Acme T-1-13076 Hammond Q003ESCF	KVA Amps	11.28 93.75	21.25 187.50	22.31 187.50	22.10 93.75	22.84 93.75	43.00 187.50	44.00 187.50	45.00 187.50	25.31 212.50	22.50 106.25	45.00 200.00	45.94 200.00	46.87 200.00	47.81 200.00
Federal SB16N5F Acme T-1-13077 Hammond Q005ESCF	KVA Amps	18.80 156.25	35.42 312.50	37.19 312.50	36.83 156.25	38.07 156.25	71.67 312.50	73.33 312.50	75.00 312.50	42.19 354.17	37.50 177.08	75.00 333.33	76.56 333.33	78.12 333.33	79.69 333.33
Catalog Number	Conn. Diag.	B	A	A	D	D	C	C	C	A	D	C	C	C	C

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Buck-Boost Transformer Selection Chart 120 x 240 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 (Available)		208Y 120	236Y 136	208	236	240	208	230	234	240	234	240
Click part # for info	Conn. Diag.	F	F	H	G	H	L	H	H	H	G	G
Federal SB16N.050F Acme T-1-81054 Hammond QC05ESCB	KVA Amps	1.12 3.13	1.28 3.13	1.13 3.12	0.64 1.56	1.30 3.12	0.56 1.56	1.33 3.33	1.35 3.33	1.39 3.33	0.72 1.77	0.74 1.77
Federal SB16N.100F Acme T-1-81055 Hammond QC10ESCB	KVA Amps	2.25 6.25	2.55 6.25	2.25 6.25	1.28 3.13	2.60 6.25	1.13 3.13	2.65 6.67	2.71 6.67	2.77 6.67	1.43 3.54	1.47 3.54
Federal SB16N.150F Acme T-1-81056 Hammond QC15ESCB	KVA Amps	3.37 9.38	3.83 9.38	3.38 9.37	1.91 4.69	3.90 9.37	1.69 4.69	3.98 10.00	4.06 10.00	4.16 10.00	2.15 5.31	2.21 5.31
Federal SB16N.250F Acme T-1-81057 Hammond QC25ESCB	KVA Amps	5.61 15.63	6.38 15.62	5.63 15.62	3.19 7.81	6.50 15.62	2.81 7.81	6.63 16.67	6.77 16.67	6.93 16.67	3.59 8.85	3.68 8.85
Federal SB16N.500F Acme T-1-81058 Hammond QC50ESCB	KVA Amps	11.23 31.25	12.76 31.25	11.26 31.25	6.38 15.63	12.99 31.25	5.63 15.63	13.26 33.33	13.53 33.33	13.86 33.33	7.17 17.71	7.36 17.71
Federal SB16N.750F Acme T-1-81059 Hammond QC75ESCB	KVA Amps	16.84 46.88	19.14 46.88	16.89 46.87	9.58 23.44	19.49 46.87	8.44 23.44	19.89 50.00	20.30 50.00	20.78 50.00	10.76 26.56	11.04 26.56
Federal SB16N1F Acme T-1-13073 Hammond Q1C0ESCB	KVA Amps	22.45 62.50	25.52 62.50	22.52 62.50	12.76 31.25	25.98 62.50	11.26 31.25	26.52 66.67	27.06 66.67	27.71 66.67	14.34 35.42	14.72 35.42
Federal SB16N1.5F Acme T-1-13074 Hammond Q1C5ESCF	KVA Amps	33.68 93.75	38.28 93.75	33.77 93.75	19.14 46.88	38.97 93.75	16.89 46.88	39.78 100.00	40.59 100.00	41.57 100.00	21.52 53.13	22.08 53.13
Federal SB16N2F Acme T-1-13075 Hammond Q002ESCF	KVA Amps	44.90 125.00	51.04 125.00	45.03 125.00	25.52 62.50	51.96 125.00	22.52 62.50	53.04 133.33	54.13 133.33	55.43 133.33	28.69 70.83	29.44 70.83
Federal SB16N3F Acme T-1-13076 Hammond Q003ESCF	KVA Amps	67.36 187.50	76.56 187.50	67.55 187.50	38.28 93.75	77.94 187.50	33.77 93.75	79.57 200.00	81.19 200.00	83.14 200.00	43.03 106.25	44.17 106.25
Federal SB16N5F Acme T-1-13077 Hammond Q005ESCF	KVA Amps	112.26 312.50	127.59 312.50	112.58 312.50	63.80 156.25	129.90 312.50	56.29 156.25	132.61 333.33	135.32 333.33	138.56 333.33	71.72 177.08	73.61 177.08
No. of Transformers		3	3	2	2	2	2	2	2	2	2	2
Catalog Number	Conn. Diag.	F	F	H	G	H	L	H	H	H	G	G

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Buck-Boost Transformer Selection Chart 240 x 480 Volts Primary–24/48 Volts Secondary

Single Phase		BOOSTING									BUCKING
Line Voltage (Available)		230	380	416	425	430	435	440	450	465	132	277	480	480	504
Load Voltage (Output)		276	418	458	468	473	457	462	495	483	126	231	436	457	480
Click part # for info	Conn. Diag.	B	D	D	D	D	C	C	D	C	C	B	D	C	C
Federal SB24N.050F Acme T-1-81061 Hammond QC05DTCB	KVA Amps	0.29 1.04	0.44 1.04	0.48 1.04	0.49 1.04	0.49 1.04	0.95 2.08	0.96 2.08	0.52 1.04	1.01 2.08	0.28 2.19	0.29 1.25	0.50 1.15	1.02 2.19	1.05 2.19
Federal SB24N.100F Acme T-1-81062 Hammond QC10DTCB	KVA Amps	0.58 2.08	0.87 2.08	0.95 2.08	0.97 2.08	0.99 2.08	1.90 4.17	1.93 4.17	1.03 2.08	2.01 4.17	0.55 4.38	0.58 2.50	1.00 2.29	2.00 4.38	2.10 4.38
Federal SB24N.150F Acme T-1-81063 Hammond QC15DTCB	KVA Amps	0.86 3.13	1.31 3.13	1.43 3.13	1.46 3.13	1.48 3.13	2.85 6.25	2.89 6.25	1.55 3.13	3.02 6.25	0.83 6.56	0.87 3.75	1.50 3.44	3.00 6.56	3.15 6.56
Federal SB24N.250F Acme T-1-81064 Hammond QC25DTCB	KVA Amps	1.44 5.21	2.18 5.21	2.38 5.21	2.43 5.21	2.46 5.21	4.76 10.42	4.81 10.42	2.58 5.21	5.03 10.42	1.38 10.94	1.44 6.25	2.50 5.73	5.00 10.94	5.25 10.94
Federal SB24N.500F Acme T-1-81065 Hammond QC50DTCB	KVA Amps	2.88 10.42	4.35 10.42	4.77 10.42	4.87 10.42	4.93 10.42	9.52 20.83	9.63 20.83	5.16 10.42	10.06 20.83	2.75 21.88	2.89 12.50	5.00 11.46	10.00 21.88	10.50 21.88
Federal SB24N.750F Acme T-1-81066 Hammond QC75DTCB	KVA Amps	4.31 15.63	6.53 15.63	7.15 15.62	7.30 15.63	7.39 15.63	14.27 31.25	14.44 31.25	7.73 15.63	15.09 31.25	4.13 32.81	4.33 18.75	7.50 17.91	15.00 32.81	15.75 17.19
Federal SB24N1F Acme T-1-37920 Hammond Q1C0DTCB	KVA Amps	5.75 20.83	8.71 20.83	9.53 20.83	9.74 20.83	9.85 20.83	19.03 41.67	19.25 41.67	10.31 20.83	20.13 41.67	5.50 43.75	5.77 25.00	10.00 22.92	20.00 43.75	21.00 43.75
Federal SB24N1.5F Acme T-1-37921 Hammond Q1C5DTCF	KVA Amps	8.63 31.25	13.06 31.25	14.30 31.25	14.61 31.25	14.78 31.25	28.55 62.50	28.88 62.50	15.47 31.25	30.19 62.50	8.25 65.63	8.66 37.50	15.00 34.37	30.00 65.63	31.50 65.63
Federal SB24N2F Acme T-1-37922 Hammond Q002DTCF	KVA Amps	11.50 41.67	17.42 41.67	19.07 41.67	19.48 41.67	19.71 41.67	38.06 83.33	38.50 83.33	20.63 41.67	40.25 83.33	11.00 87.50	11.54 50.00	20.00 45.83	40.00 87.50	42.00 87.50
Federal SB24N3F Acme T-1-37923 Hammond Q003DTCF	KVA Amps	17.25 62.50	26.13 62.50	28.60 62.50	29.22 62.50	29.56 62.50	57.09 125.00	57.75 125.00	30.94 62.50	60.38 125.00	16.50 131.25	17.31 75.00	30.00 68.75	60.00 131.25	63.00 131.25
Federal SB24N5F Acme T-1-37924 Hammond Q005DTCF	KVA Amps	28.75 104.17	43.54 104.17	47.67 104.17	48.70 104.17	49.27 104.17	95.16 208.33	96.25 208.33	51.56 104.17	100.63 208.33	27.50 218.75	28.85 125.00	50.00 114.58	100.00 218.75	105.00 218.75
Catalog Number	Conn. Diag.	B	D	D	D	D	C	C	D	C	C	B	D	C	C

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Buck-Boost Transformer Selection Chart 240 x 480 Volts Primary–24/48 Volts Secondary

Three Phase		BOOSTING								BUCKING
Line Voltage (Available)		399Y 230	380	430	440	460	460	480	480	440	440	460	460	460	480	500	500
Load Voltage (Available)		480Y 277	418	473	462	506	483	528	504	400	419	438	418	457	436	455	476
Click part # for info	Conn. Diag.	E	G	G	H	G	H	G	H	G	H	H	G	H	G	G	H
Federal SB24N.050F Acme T-1-81061 Hammond QC05DTCB	KVA Amps	0.86 1.04	0.75 1.04	0.85 1.04	1.67 2.08	0.91 1.04	1.74 2.08	0.95 1.04	1.82 2.08	0.79 1.15	1.59 2.19	1.66 2.19	0.83 1.15	1.73 2.19	0.87 1.15	0.90 1.15	1.80 2.19
Federal SB24N.100F Acme T-1-81062 Hammond QC10DTCB	KVA Amps	1.73 2.08	1.51 2.08	1.71 2.08	3.33 4.17	1.83 2.08	3.49 4.17	1.91 2.08	3.64 4.17	1.59 2.29	3.18 4.38	3.32 4.38	1.66 2.29	3.46 4.38	1.73 2.29	1.80 2.29	3.61 4.38
Federal SB24N.150F Acme T-1-81063 Hammond QC15DTCB	KVA Amps	2.59 3.13	2.26 3.13	2.56 3.13	5.00 6.25	2.74 3.13	5.23 6.25	2.86 3.13	5.46 6.25	2.38 3.44	4.76 6.56	4.98 6.56	2.49 3.44	5.20 6.56	2.60 3.44	2.71 3.44	5.41 6.56
Federal SB24N.250F Acme T-1-81064 Hammond QC25DTCB	KVA Amps	4.32 5.21	3.77 5.21	4.27 5.21	8.34 10.42	4.56 5.21	8.71 10.42	4.76 5.21	9.09 10.42	3.97 5.73	7.94 10.94	8.30 10.94	4.15 5.73	8.66 10.94	4.33 5.73	4.51 5.73	9.02 10.94
Federal SB24N.500F Acme T-1-81065 Hammond QC50DTCB	KVA Amps	8.64 10.42	7.54 10.42	8.53 10.42	16.67 20.83	9.13 10.42	17.43 20.83	9.53 10.42	18.19 20.83	7.94 11.46	15.88 21.88	16.60 21.88	8.30 11.46	17.32 21.88	8.66 11.46	9.02 11.46	18.04 21.88
Federal SB24N.750F Acme T-1-81066 Hammond QC75DTCB	KVA Amps	12.96 15.62	11.31 15.63	12.80 15.63	25.01 31.25	13.69 15.63	26.14 31.25	14.29 15.63	27.28 31.25	11.91 17.19	23.82 32.81	24.90 32.81	12.45 17.19	25.98 32.81	12.99 17.19	13.53 17.19	27.06 32.81
Federal SB24N1F Acme T-1-37920 Hammond Q1C0DTCB	KVA Amps	17.28 20.83	15.08 20.83	17.07 20.83	33.34 41.67	18.26 20.83	34.86 41.67	19.05 20.83	36.37 41.67	15.88 22.92	31.75 43.75	33.20 43.75	16.60 22.92	34.64 43.75	17.32 22.92	18.04 22.92	36.08 43.75
Federal SB24N1.5F Acme T-1-37921 Hammond Q1C5DTCF	KVA Amps	25.92 31.25	22.62 31.25	25.60 31.25	50.01 62.50	27.39 31.25	52.29 62.50	28.58 31.25	54.66 62.50	23.82 34.38	47.63 65.63	49.80 65.63	24.90 34.38	51.96 65.63	25.98 34.37	27.06 34.37	54.13 65.63
Federal SB24N2F Acme T-1-37922 Hammond Q002DTCF	KVA Amps	34.55 41.67	30.17 41.67	34.14 41.67	66.68 83.33	36.52 41.67	69.72 83.33	38.11 41.67	72.75 83.33	31.75 45.83	63.51 87.50	66.40 87.50	33.20 45.83	69.28 87.50	34.64 45.83	36.08 45.83	72.17 87.50
Federal SB24N3F Acme T-1-37923 Hammond Q003DTCF	KVA Amps	51.83 62.50	45.25 62.50	51.20 62.50	100.03 125.00	54.78 62.50	104.57 125.00	57.16 62.50	109.12 125.00	47.63 68.75	95.26 131.25	99.59 131.25	49.80 68.75	103.92 131.25	51.96 68.75	54.13 68.75	108.25 131.25
Federal SB24N5F Acme T-1-37924 Hammond Q005DTCF	KVA Amps	86.39 104.17	75.42 104.17	85.34 104.17	166.71 208.33	91.29 104.17	174.29 208.33	95.26 104.17	181.87 208.33	79.39 114.58	158.77 218.75	165.99 218.75	82.99 114.58	173.21 218.75	86.60 114.58	90.21 114.58	180.42 218.75
No. of Transformers		2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2
Catalog Number	Conn. Diag.	E	G	G	H	G	H	G	H	G	H	H	G	H	G	G	H

	Output for lower voltage can be found by:	Rated Output Voltage Rated Input Voltage	x  Input Actual Voltage = Output New Voltage.
Output KVA available at reduced voltage can be found by:		Actual Input Voltage Rated Input Voltage	x  Output KVA = New KVA Rating.

Cons:
Buck Boost Transformers provide no circuit isolation under most common uses, the KVA and voltages do not match those on the nameplate, and they cannot create a neutral.

Pros:
They are inexpensive, smaller and lighter, more efficient, and can be used in a variety of applications. They are also often wired with at least 4 windings. This makes them more versatile because they can be wired eight different ways and provide a number of KVA and voltage choices.

Important!!! Buck Boost Transformers do not adjust for variable voltage conditions but only handle chronically existing high or low situations. You will probably need to install an AC Line Reactor to address that problem.

Warning!!! Significant damage can be incurred if some equipment and applications are run at voltages higher or lower than their rated load. Buck Boost Transformers will prevent this!

Contact TEMCo for your Buck Boost Transformer needs. TEMCo carries most major brands and offers competitive pricing with quick delivery. Custom-made products are also available.

Contractors and individuals who need portable power sources and lighting may also want to check out the Diesel Generators available through TEMCo.

Call (510) 490-2187
(US & International)
 or 1-800-613-2290 (US only)
for prices and information.
Wholesale Pricing Available!

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BUCK BOOST TRANSFORMERS

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