Buck Boost Transformers

Step Down Transformers

Step Down Transformers Home

To Buy Buck Boost Transformers, Call TEMCo
1-510-490-2187 or
1-800-613-2290.
Link: Buck Boost Transformers

What is a Step Down Transformer?
Devices that are used to step down electrical current at input power sources, which allows voltage to be compatible with equipment.

Voltage Transformers
Transformers that are designed for specific applications that need specified electrical voltage.

Step Up Transformers
A transformer that has the secondary winding higher than the primary allowing the transformer to increase input voltage.

Power Transformers
Devices that convert the incoming line voltage to a higher or lower electrical current to match voltage of equipment.

Three Phase Transformers
Transformers that are used throughout industry to change values of three phase voltage and current.

Isolation Transformers
Transformers that transfer energy from the alternating current supply to an electrical load. They prevent certain types of harmonics.

Buck Boost Transformers
Buck Boost devices are used to make small adjustments to incoming voltages such as lighting applications.

Phase Converters
Devices that convert single phase power into three phase power.

Acme Transformers
Acme Transformers is an industrial leader offering superior service, quality products and technical service.

Ace Phase Converters
Ace Phase Converter has been in business for 25 years and their professional and experienced engineering staff can assist you with your phase converter application requirements.

Buck boost transformers are single phase, four winding transformers designed for two purposes. The first is to reduce or raise line voltage from five to 20 percent. A good example is boosting 208 volts to 230 volts. They have a dual voltage primary and a dual voltage secondary.

The second use of buck boost transformers is to use them as low voltage isolation transformers for use on 12, 16, 24, 32, or 48 colt circuits. They have capacities of .050 kVA to 5.0 kVA. Some of the applications include low voltage landscaping lighting, and they are UL listed for outdoor service.

Buck boost transformers are ideal for changing line voltage by small amounts. Some of the major advantages for using buck boost transformers are their low cost, compact size and light weight. They are also more efficient and cost less than isolation transformers. When connected as autotransformers, they can handle loads up to 20 times the name plate rating. A great source for all of your buck boost transformers is TEMCo Buck Boost Transformers. You can be assured when buying a transformer, TEMCo or Acme Transformers are the best transformers for your money.

When the buck boost transformer has the primary and secondary windings connected, it becomes an autotransformer. With this technology, only the secondary windings are transforming voltage and current. The majority of the KVA load passes directly from the supply to the load. This is the reason autotransformers can supply a load with a larger KVA rating than the nameplate indicates.

Always remember when purchasing a step down transformer, seek out a more reputable and experienced manufacturer such as Acme Step Down Transformers. A quality manufacturer will save you money in the long run and provide many years of quality service.

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.

Read about the Importance of Step Down Transformers

Step Down Transformers

Step Down Transformers come in sizes as small as thumb nails to as large as big power grid units.

Information on TEMCo Manufacturing

The Importance of Using an Experienced and Reputable Manufacturer

Step-down transformer play a important role in electrical power

Step Down Transformers are used at large power plants to step down high voltage input.

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