Power Transformers

Buck Boost Transformers

◙ 3 Phase Transformers ◙ 3 Phase Converters ◙ Medical Isolation Transformers ◙ Isolation Transformers ◙ Buck Boost Transformers
◙ Custom Transformers ◙ Step Down Transformers ◙ Step up Transformers ◙ AC Line Reactors ◙ Acme Transformers
◙ Hammond Transformers ◙ Jefferson Transformers

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3 Phase Transformers
Used to set voltages in all 3 phase applications where a 3 phase power supply exists.

3 Phase Converters
Convert single phase to 3 phase power when 3 phase is most desirable.

Medical Isolation Transformers
Necessary for any hospital and medical equipment covered by state and federal safety and performance regulations.

Isolation Transformers
Separates the incoming power from that which finally runs the equipment. Protects against unwanted characteristics generated in the use of power within an area.

Buck Boost Transformers
Often used for low voltage applications and raising voltage for 230V motors or 120V lighting systems; designed to reduce (buck) or raise (boost) line voltage from 5% to 20%.

Custom Transformers
Specific needs can be filled by custom building a transformer to the requirements of the customer.

Step Down Transformers
Adjust voltage from high voltage transmission lines or to correct local lines for chronically high voltage conditions.

Step Up Transformers
Adjust voltage for transmission at higher voltages or to correct local lines for chronically low voltages.

AC Line Reactors
Adjust, block or otherwise handle unwanted power characteristics often generated during normal use of power in an area.

Acme Transformers
A reliable leading American transformer distributing company.

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

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

PURPOSE AND APPLICATIONS
OF BUCK BOOST TRANSFORMERS

Buck Boost Transformers are small single-phase transformers commonly used when voltages are consistently too high or too low to efficiently run equipment like motors and electronics when these applications best run at their rated power demand. These are a very economical way to achieve optimum electrical service. Adjusting 208V conditions to 230V for motors and going from 110V to 120V for lighting are two common examples. Buck Boost transformers are not intended to correct variable voltage conditions.

Buck Boost Transformers are built to reduce (buck) or raise (boost) line voltage from 5% to 20%. They specifically address chronically off-standard local voltage conditions and adjust to optimum for the equipment to be used.

Adjusting local voltages for industrial and commercial heating and air conditioning systems and boosting 240V to 277V for lighting systems are also very common uses.

Buck Boost Transformers are additionally employed in lower voltage applications. Landscape lighting and low voltage lighting are examples of this type of usage. It is common to see Buck Boost transformers with primary voltages running at 120V, 240V, or 440V with secondary circuits usually running at 12, 16, 24, 32 or 48 volts, though other voltages can be custom-ordered. Sizes are often usually available in 50 VA through 10KVA.

Warning! Equipment failure can result from incorrect voltage. It can be critical to have a Buck Boost Transformer properly installed under chronically high or low voltage conditions!

Contact TEMCo for your Buck Boost Transformer needs. TEMCo carries most major brands and offers competitive pricing with quick delivery. Custom-designed Buck Boost Transformers can be ordered to fit your exact specifications.

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

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.

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PURPOSE AND APPLICATIONS
OF BUCK BOOST TRANSFORMERS

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PURPOSE AND APPLICATIONS OF BUCK BOOST TRANSFORMERS

PURPOSE AND APPLICATIONS OF BUCK BOOST TRANSFORMERS

PURPOSE AND APPLICATIONS
OF BUCK BOOST TRANSFORMERS

PURPOSE AND APPLICATIONS
OF BUCK BOOST TRANSFORMERS