Step-Up Transformers | McMaster-Carr

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Transformer Voltage Function

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48 Products

About AC to AC Voltage Transformers

For single-phase equipment, use this formula to find power output: VA = Volts × Amps

For three-phase equipment, use this formula to find power output: VA = Volts × Amps × 1.73

Single Phase

These transformers have isolated primary and secondary coils to protect your sensitive equipment from input voltage spikes.

Sealed coils and cores prevent corrosion and insulation damage.

When wired as constant voltage transformers, they filter out voltage spikes and electrical noise.

Single Phase—Wire Leads Input and Output

Voltage
Input	Output	Power Output, VA	Ht.	Wd.	Dp.	Features	Environment	Environmental Rating	Specifications Met		Each
Step Up/Step Down/Constant Voltage
120V AC, 240V AC	120V AC, 240V AC	1,000	10 1/2"	5 1/2"	5.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor	NEMA 3R	UL Listed, C-UL Listed	6989K21	0000000
120V AC, 240V AC	120V AC, 240V AC	2,000	13"	5 1/2"	5.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor	NEMA 3R	UL Listed, C-UL Listed	6989K23	000000
120V AC, 240V AC	120V AC, 240V AC	3,000	11 1/2"	10.3"	7.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor	NEMA 3R	UL Listed, C-UL Listed	6989K24	000000
120V AC, 240V AC	120V AC, 240V AC	5,000	14.4"	10.3"	7.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor	NEMA 3R	UL Listed, C-UL Listed	6989K25	00000000

Enclosed Step-Up/Step-Down AC to AC Transformers

Improve the efficiency of your equipment—wire these transformers to step your input voltage up or down by as much as 20%. Choose an input/output voltage combination that comes closest to matching your application, then choose the power output (in VA) of the equipment you want to operate. You probably won’t find the exact value you need; choose the next highest rating.

Three-phase applications require two transformers.

Note: Transfomers are labeled with a prewired power output and pre-wired primary and secondary voltages. Single phase transformers are labeled as 120/240V AC primary voltage and 12/24V AC secondary voltage.Three phase transformers are labeled as 120/240V AC primary voltage and 16/32V AC secondary voltage. All possible input voltage and output voltage wiring combinations are listed.

	Prewired
Input/Output Voltage— Power Output	Power Output Label, VA	Primary Voltage Label	Secondary Voltage Label	Ht.	Wd.	Dp.		Each
Single Phase—Wire Leads Input and Output
Step Up/Step Down Voltage
100V AC/120V AC—250VA 110V AC/120V AC—500VA 125V AC/113V AC—520VA 132V AC/120V AC—540VA 189V AC/208V AC—430VA 208V AC/230V AC—480VA 220V AC/242V AC—500VA 230V AC/208V AC—470VA 245V AC/222V AC—500VA 252V AC/240V AC—1,020VA	50	120V AC/240V AC	12V AC/24V AC	6.4"	3.1"	3.1"	70525K71	0000000
100V AC/120V AC—500VA 110V AC/120V AC—1,010VA 125V AC/113V AC—1,040VA 132V AC/120V AC—1,080VA 189V AC/208V AC—870VA 208V AC/230V AC—960VA 220V AC/242V AC—1,010VA 230V AC/208V AC—950VA 245V AC/222V AC—1,000VA 252V AC/240V AC—2,040VA	100	120V AC/240V AC	12V AC/24V AC	7.2"	3.9"	3.7"	70525K72	000000
100V AC/120V AC—750VA 110V AC/120V AC—1,510VA 125V AC/113V AC—1,560VA 132V AC/120V AC—1,620VA 189V AC/208V AC—1,300VA 208V AC/230V AC—1,430VA 220V AC/242V AC—1,510VA 230V AC/208V AC—1,420VA 245V AC/222V AC—1,500VA 252V AC/240V AC—3,000VA	150	120V AC/240V AC	12V AC/24V AC	7.2"	3.9"	3.7"	70525K73	000000
100V AC/120V AC—1,250VA 110V AC/120V AC—2,500VA 125V AC/113V AC—2,600VA 132V AC/120V AC—2,750VA 189V AC/208V AC—2,160VA 208V AC/230V AC—2,390VA 220V AC/242V AC—2,520VA 230V AC/208V AC—2,370VA 245V AC/222V AC—2,500VA 252V AC/240V AC—5,100VA	250	120V AC/240V AC	12V AC/24V AC	8.7"	4.1"	3.9"	70525K74	000000
100V AC/120V AC—2,500VA 110V AC/120V AC—5,000VA 125V AC/113V AC—5,200VA 132V AC/120V AC—5,400VA 189V AC/208V AC—4,330VA 208V AC/230V AC—4,790VA 220V AC/242V AC—5,040VA 230V AC/208V AC—4,470VA 245V AC/222V AC—5,000VA 252V AC/240V AC—10,200VA	500	120V AC/240V AC	12V AC/24V AC	9.1"	4.4"	4.2"	70525K75	000000
100V AC/120V AC—3,750VA 110V AC/120V AC—7,560VA 125V AC/113V AC—7,800VA 132V AC/120V AC—8,150VA 189V AC/208V AC—6,500VA 208V AC/230V AC—7,190VA 220V AC/242V AC—7,560VA 230V AC/208V AC—7,100VA 245V AC/222V AC—7,500VA 252V AC/240V AC—15,300VA	750	120V AC/240V AC	12V AC/24V AC	9.7"	4.8"	4 1/2"	70525K76	000000
100V AC/120V AC—5,000VA 110V AC/120V AC—10,000VA 125V AC/113V AC—10,400VA 132V AC/120V AC—10,800VA 189V AC/208V AC—8,660VA 208V AC/230V AC—9,580VA 220V AC/242V AC—10,000VA 230V AC/208V AC—9,500VA 245V AC/222V AC—10,000VA 252V AC/240V AC—20,400VA	1,000	120V AC/240V AC	12V AC/24V AC	10 1/2"	5 1/2"	5.1"	70525K77	000000
Single/Three Phase—Wire Leads Input and Output
Step Up/Step Down Voltage
195V AC/208V AC—5,630VA 208V AC/240V AC—3,170VA 225V AC/240V AC—6,500VA 240V AC/208V AC—2,810VA 245V AC/230V AC—6,630VA 256V AC/240V AC—6,930VA 265V AC/234V AC—3,590VA 272V AC/240V AC—3,680VA	250	120V AC/240V AC	16V AC/32V AC	8.7"	4.1"	3.9"	70525K81	000000
195V AC/208V AC—11,260VA 208V AC/240V AC—6,330VA 225V AC/240V AC—12,990VA 240V AC/208V AC—5,630VA 245V AC/230V AC—13,260VA 256V AC/240V AC—13,860VA 265V AC/234V AC—7,170VA 272V AC/240V AC—7,360VA	500	120V AC/240V AC	16V AC/32V AC	9.1"	4.4"	4.2"	70525K82	000000
195V AC/208V AC—16,890VA 208V AC/240V AC—9,500VA 225V AC/240V AC—19,490VA 240V AC/208V AC—8,440VA 245V AC/230V AC—19,890VA 256V AC/240V AC—20,780VA 265V AC/234V AC—10,760VA 272V AC/240V AC—11,040VA	750	120V AC/240V AC	16V AC/32V AC	9.7"	4.8"	4 1/2"	70525K83	000000
195V AC/208V AC—22,520VA 208V AC/240V AC—12,670VA 225V AC/240V AC—25,980VA 240V AC/208V AC—11,260VA 245V AC/230V AC—26,520VA 256V AC/240V AC—27,710VA 265V AC/234V AC—14,340VA 272V AC/240V AC—14,720VA	1,000	120V AC/240V AC	16V AC/32V AC	10 1/2"	5 1/2"	5.1"	70525K84	000000

Enclosed Voltage-Stabilizing AC to AC Transformers

Protect sensitive equipment from electromagnetic interference and maintain power during three-millisecond power dips. These transformers also isolate output and input voltage (output regulation is ±3% with input voltage fluctuations from +10% to -20%). When wired for constant voltage, transformers filter out voltage spikes and electrical noise.

Voltage
Input	Output	Power Output, VA	Ht.	Wd.	Dp.	Specifications Met		Each
Single Phase—Screw Terminals Input and Output
Step Up/Step Down/Constant Voltage
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	140	4.4"	6"	8 1/2"	UL Listed, CSA Certified	7425K33	0000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	250	4.4"	6"	9.7"	UL Listed, CSA Certified	7425K34	000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	500	6 1/2"	6.3"	12.3"	UL Listed, CSA Certified	7425K35	00000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	750	6 1/2"	6.3"	13.3"	UL Listed, CSA Certified	7425K36	00000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	1,000	6 1/2"	6.3"	14.2"	UL Listed, CSA Certified	7425K37	00000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	1,500	9.9"	9.4"	17.6"	UL Listed, CSA Certified	7425K39	00000000
120V AC, 208V AC, 240V AC, 480V AC	120V AC, 208V AC, 240V AC	3,000	9.9"	9.4"	19.9"	UL Listed, CSA Certified	7425K42	00000000

International AC to AC Transformers

Output for Germany, Spain, and United States

Output for Europe and United States

CEE 7/3 Socket

NEMA 5-15 Socket

Two-Prong Plug

Universal Socket

These transformers continuously operate at 80% of the rated power output. They convert voltage to run American appliances in Europe or European appliances in the United States. These transformers are CE Marked, which means they meet European Union safety standards.

	Input		Output
Power Output, VA	Plug Type	Plug Style	Socket Type	Socket Style	No. of Outputs	Frequency, Hz	Ht.	Wd.	Dp.	Plug Adapter Type (Style)		Each
Single Phase—Step Up/Step Down Voltage, 110V AC/220V AC Input and Output
Socket Output for Germany, Spain and United States
100	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 1	50/60	3"	3"	5"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K111	000000
200	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 1	50/60	3 1/4"	3 1/2"	5 3/4"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K112	00000
300	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 2	50/60	3 1/2"	3 3/4"	6"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K81	000000
500	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 2	50/60	3 1/2"	4"	6 1/2"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K82	000000
800	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 2	50/60	4 1/2"	5 1/4"	7 1/2"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K113	000000
1,000	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	1 2	50/60	4 3/4"	6 1/4"	9"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K83	000000
1,500	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	2 2	50/60	5 3/4"	6 3/4"	9 3/4"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K114	000000
2,000	Two Prong	CEE 7/7 (Europe)	Two Slot Three Slot	CEE 7/3 (Germany, Spain) NEMA 5-15 (United States)	2 2	50/60	6"	7 1/2"	9 3/4"	NEMA 1-15 (United States), NEMA 5-15 (United States)	70285K84	000000
Socket Output for Europe and United States
3,000	Two Prong	CEE 7/7 (Europe)	Three Slot Three Slot	Universal (Europe) NEMA 5-15 (United States)	1 1	50/60	5 3/4"	7"	9 3/4"	NEMA 1-15 (United States), NEMA 5-15 (United States), BS 1363; UK1-13 (United Kingdom)	70285K115	000000

Panel-Mount Variable-Voltage AC to AC Transformers

Permanently install these transformers in panels. Turn the dial to adjust the voltage you need within a given range. Also known as variacs, they are often used in laboratories to vary power, heat, speed, or force. When wired for constant voltage, transformers filter out voltage spikes and electrical noise.

Voltage
Input	Output	Power Output, VA	Max. Current, A	Ht.	Wd.	Dp.	Specifications Met		Each
Single Phase—Screw Terminals Input and Output
Step Up/Step Down/Constant Voltage
240V AC	0V AC-280V AC	980	3.5	5.6"	4.4"	4.2"	CSA Certified	6994K42	0000000

Bench-Top Variable-Voltage AC to AC Transformers

NEMA 5-15 Plug

NEMA 5-15 Socket

NEMA 5-20 Plug

NEMA 5-20 Socket

NEMA 6-15 Socket

NEMA 6-15 Plug

Mount these portable transformers to any flat surface. Turn the dial to adjust the voltage you need within a given range. Also known as variacs, they are often used in laboratories to vary power, heat, speed, or force.

When wired for constant voltage, transformers filter out voltage spikes and electrical noise.

Voltage
Input	Output	Power Output, VA	Max. Current, A	Input Plug Type (NEMA Style)	Input Cord Lg., ft.	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.	Features	Specifications Met		Each
Single Phase—Plug Input and Socket Output
Step Up/Step Down/Constant Voltage
120V AC	0V AC-132V AC	330	2.5	Three Prong (5-15)	6	Three Slot (5-15)	5.3"	6.1"	4.1"	Fuse, Power-Indicating Light	CSA Certified	6994K11	0000000
120V AC	0V AC-140V AC	700	5	Three Prong (5-15)	6	Three Slot (5-15)	5.3"	6.1"	4.1"	Fuse, Power-Indicating Light	__	6994K14	000000
120V AC	0V AC-140V AC	1,400	10	Three Prong (5-15)	6	Three Slot (5-15)	7"	4.6"	5.5"	Fuse, Power-Indicating Light	CSA Certified	6994K17	000000
120V AC	0V AC-140V AC	2,100	15	Three Prong (5-15)	6	Three Slot (5-15)	9.4"	6.2"	6"	Fuse, Power-Indicating Light	CSA Certified	6994K21	00000000
120V AC	0V AC-140V AC	3,080	22	Three Prong (5-20)	6	Three Slot (5-20)	10.9"	8"	6.3"	Fuse, Power-Indicating Light	__	6994K23	00000000
240V AC	0V AC-280V AC	980	3.5	Three Prong (6-15)	6	Three Slot (6-15)	7"	4.6"	5.5"	Fuse, Power-Indicating Light	__	6994K18	000000
240V AC	0V AC-280V AC	2,660	9.5	Three Prong (6-15)	6	Three Slot (6-15)	9.4"	6.2"	6"	Fuse, Power-Indicating Light	__	6994K22	00000000

DC to AC Transformers for Sensitive Electronic Loads

These transformers produce AC output that most closely resembles clean, stable AC-generated power. Also known as inverters and converters, they prevent damage from overloads, short circuits, and overheating.

Single Phase—Plug Input and Socket Output

With Vehicle Input Plug

NEMA 5-15 Socket

	Voltage		Output
No. of Outlets	Input	Output	Power, W	Current, A	Input Plug Type	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.		Each
Step Up Voltage
1	12V DC	120V AC	125	1.1	Vehicle	Three Slot (5-15)	2.2"	4.9"	7.9"	70555K11	0000000

Single Phase—Wire Leads Input and Socket Output

With Wire Leads

NEMA 5-15 Socket

	Voltage		Output
No. of Outlets	Input	Output	Power, W	Current, A	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.		Each
Step Up Voltage
1	24V DC	120V AC	125	1.1	Three Slot (5-15)	2.2"	4.9"	7.9"	70555K17	0000000

Single Phase—Stud Terminals Input and Socket Output

With Stud Terminals

NEMA 5-15 Socket

	Voltage		Output
No. of Outlets	Input	Output	Power, W	Current, A	Output Socket Type (NEMA Style)	Stud Size	Ht.	Wd.	Dp.		Each
Step Up Voltage
2	12V DC	120V AC	600	5.1	Three Slot (5-15)	5/16"	3.6"	7.7"	12.1"	70555K13	0000000
2	12V DC	120V AC	1,100	9.5	Three Slot (5-15)	5/16"	3.6"	7.7"	15"	70555K14	00000000

DC to AC Transformers

With 3 Outlets

With 4 Outlets

NEMA 5-15 Socket

Use DC voltage to power devices that run on AC voltage. Also known as inverters and converters, they prevent damage from overloads.

	Voltage		Output
No. of Outlets	Input	Output	Power, W	Current, A	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.		Each
Single Phase—Screw Terminals Input and Socket Output
Step Up Voltage
3	12V DC	120V AC	700	5.8	Three Slot (5-15)	2.8"	5"	8.2"	6987K29	0000000
4	12V DC	120V AC	1,000	8.3	Three Slot (5-15)	4.3"	6"	13"	6987K42	000000
4	12V DC	120V AC	1,800	15	Three Slot (5-15)	4"	6"	15"	6987K23	000000

DC to AC Transformers for Motor Loads

Provide AC power to devices that temporarily draw high output, such as motors. These transformers are designed to withstand starting surges up to twice the power output rating. Also known as inverters and converters, they prevent damage from overloads.

Single Phase—Plug Input and Socket Output

With Vehicle Input Plug

NEMA 5-15 Socket

	Voltage		Output
Number of Outlets	Input	Output	Power, W	Current, A	Input Plug Type	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.		Each
Step Up Voltage
2	11V DC-15V DC	115V AC	320	2.8	Vehicle	Three Slot (5-15)	2"	4.1"	6.1"	76815K85	0000000

Single Phase—Screw Terminals Input and Socket Output

With Screw Terminals

NEMA 5-15 Socket

	Voltage		Output
Number of Outlets	Input	Output	Power, W	Current, A	Output Socket Type (NEMA Style)	Ht.	Wd.	Dp.		Each
Step Up Voltage
2	12V DC	120V AC	1,250	10.4	Three Slot (5-15)	7"	8.8"	9"	6987K91	0000000

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About AC to AC Voltage Transformers

Enclosed Isolating AC to AC Transformers

Enclosed Step-Up/Step-Down AC to AC Transformers

Enclosed Voltage-Stabilizing AC to AC Transformers

International AC to AC Transformers

Panel-Mount Variable-Voltage AC to AC Transformers

Bench-Top Variable-Voltage AC to AC Transformers

DC to AC Transformers for Sensitive Electronic Loads

DC to AC Transformers

DC to AC Transformers for Motor Loads