Variable Output Transformers

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46 Products

About Transformers

Compare transformer features and learn about voltages. Then, choose the transformer that's right for your application.

Bench-Top Variable-Voltage Transformers

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.

Single Phase—Plug Input and Socket Output Connection

Image of Product. Front orientation. Transformers. Bench-Top Variable-Voltage Transformers.


NEMA 5-15 Plug	NEMA 5-20 Plug	NEMA 6-15 Plug

NEMA 5-15 Socket	NEMA 5-20 Socket	NEMA 6-15 Socket

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

	Voltage, V AC			Input		Output
	Input	Output	Power Output, VA	Plug Connection	Connection NEMA Type	Socket Connection	Connection NEMA Type	Max. Current, amp	Ht.	Wd.	Dp.	Features	Certification		Each
Step-Up/Step-Down/Constant Voltage



		120	0 to 132	330	3-Blade Straight	5-15	3-Slot Straight	5-15	2.5	5.3"	6.1"	4.1"	Fuse, Power-Indicating Light	CSA Certified	6994K11	0000000


		120	0 to 140	700	3-Blade Straight	5-15	3-Slot Straight	5-15	5	5.3"	6.1"	4.1"	Fuse, Power-Indicating Light	—	6994K14	000000
		120	0 to 140	1,400	3-Blade Straight	5-15	3-Slot Straight	5-15	10	7"	4.6"	5 1/2"	Fuse, Power-Indicating Light	CSA Certified	6994K17	000000
		120	0 to 140	2,100	3-Blade Straight	5-15	3-Slot Straight	5-15	15	9.4"	6.2"	6"	Fuse, Power-Indicating Light	CSA Certified	6994K21	00000000
		120	0 to 140	3,080	3-Blade Straight	5-20	3-Slot Straight	5-20	22	10.9"	8"	6.3"	Fuse, Power-Indicating Light	—	6994K23	00000000
		240	0 to 280	980	3-Blade Straight	6-15	3-Slot Straight	6-15	3.5	7"	4.6"	5 1/2"	Fuse, Power-Indicating Light	—	6994K18	000000
		240	0 to 280	2,660	3-Blade Straight	6-15	3-Slot Straight	6-15	9.5	9.4"	6.2"	6"	Fuse, Power-Indicating Light	—	6994K22	00000000


		Step-Down/Constant Voltage



				120	0 to 120	1,440	3-Blade Straight	5-15	3-Slot Straight	5-15	12	7"	4.6"	5 1/2"	Fuse, Power-Indicating Light	CSA Certified	6994K24	000000


				240	0 to 240	1,200	3-Blade Straight	6-15	3-Slot Straight	6-15	5	7"	4.6"	5 1/2"	Fuse, Power-Indicating Light	CSA Certified	6994K19	00000000

Panel-Mount Variable-Voltage 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.

Single Phase—Quick-Disconnect Terminal Input and Output Connection

Image of Product. Front orientation. Transformers. Panel-Mount Variable-Voltage Transformers.

	Voltage, V AC
	Input	Output	Power Output, VA	Max. Current, amp	Quick-Disconnect Tab Wd.	Ht.	Wd.	Dp.	Certification		Each
Step-Down/Constant Voltage



		120	0 to 120	210	1.75	0.25"	3.3"	2.9"	1.9"	CSA Certified	6994K31	0000000


		120	0 to 120	300	2.5	0.25"	3.3"	2.9"	2.1"	CSA Certified	6994K32	000000
		120	0 to 120	360	3	0.25"	3.3"	2.9"	2.4"	CSA Certified	6994K33	000000
		120	0 to 120	600	5	0.25"	4.4"	3.8"	3"	CSA Certified	6994K34	000000

Single Phase—Screw-Terminal Input and Output Connection

	Voltage, V AC
	Input	Output	Power Output, VA	Max. Current, amp	Ht.	Wd.	Dp.	Certification		Each
Step-Up/Step-Down/Constant Voltage



		240	0 to 280	980	3.5	5.6"	4.4"	4.2"	CSA Certified	6994K42	0000000


		Step-Down/Constant Voltage



				120	0 to 120	1,200	10	5.6"	4.4"	4.2"	CSA Certified	6994K35	000000


				120	0 to 120	1,440	12	5.6"	4.4"	4.2"	CSA Certified	6994K39	000000
				120	0 to 120	1,800	15	6.8"	6.1"	4.3"	CSA Certified	6994K37	000000
				120	0 to 120	3,000	25	8.3"	7.6"	4.4"	CSA Certified	6994K44	00000000
				240	0 to 240	1,200	5	5.6"	4.4"	4.2"	CSA Certified	6994K36	000000
				240	0 to 240	2,280	9.5	6.8"	6.1"	4.6"	CSA Certified	6994K38	000000

Ultra-Low-Noise Bench-Mount Power Supplies

Change AC voltage to DC voltage to power extremely sensitive audio, measuring, and testing devices while keeping electronic interference—often called output or ripple noise—from passing on to the device. The lower the output noise value, the less interference the power supplies will create. Although they create less noise than other power supplies, these power supplies are larger, heavier, and give off more heat.

View the output on a digital or analog display.

If you exceed the maximum load or current, all of these power supplies will shut down to protect both the power supply and the connected device.

With 1 Output Power Connection—Digital Display

Digital displays are often easier to read than analog displays, so you can quickly see if you need to make adjustments.

Over Temperature—Those with overvoltage or over temperature protection will shut down if you exceed the maximum voltage or temperature.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket	0V DC to 18V DC	0 amp to 5 amp	0 W to 90 W	4 mV DC	Front	Constant Current, Constant Voltage	5.5"	6.5"	10.4"	Over Temperature, Overcurrent, Overload	7686K25	0000000


		Standard Banana Socket	0V DC to 30V DC	0 amp to 3 amp	0 W to 90 W	4 mV DC	Front	Constant Current, Constant Voltage	5.5"	6.5"	10.4"	Over Temperature, Overcurrent, Overload	7686K24	000000
		Standard Banana Socket	0V DC to 30V DC	0 amp to 6 amp	0 W to 180 W	5 mV DC	Front	Constant Current, Constant Voltage	5.5"	6.5"	10.4"	Over Temperature, Overcurrent, Overload	7686K27	000000
		Standard Banana Socket	1V DC to 18V DC	0 amp to 3 amp	0 W to 54 W	2 mV DC	Front	Constant Current, Constant Voltage	4.3"	9.4"	6"	Overcurrent, Overload	5773N12	000000
		Standard Banana Socket	1V DC to 30V DC	0 amp to 1 amp	0 W to 30 W	2 mV DC	Front	Constant Current, Constant Voltage	4.3"	9.4"	6"	Overcurrent, Overload	5773N11	000000

With 1 Output Power Connection—Analog Display

Analog displays are better than digital displays for monitoring fast output changes, such as dips and spikes.

Output Voltage Selector Switch—Power supplies with an output voltage selector switch let you toggle between two voltage and current output ranges.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket	0V DC to 30V DC	0 amp to 2 amp	0 W to 60 W	5 mV DC	Front	Constant Current, Constant Voltage	4.3"	8"	8.3"	Overcurrent, Overload	7686K21	0000000


		Standard Banana Socket	0V DC to 18V DC, 0V DC to 36V DC	0 amp to 7 amp, 0 amp to 3.5 amp	0 W to 126 W	4 mV DC	Front	Constant Current, Constant Voltage, Output Voltage Selector Switch	5.5"	12.1"	10.5"	Overcurrent, Overload	7686K26	000000

With 2 Output Power Connections—Analog Display

Analog displays are better than digital displays for monitoring fast output changes, such as dips and spikes.

Over Temperature—Those with overvoltage or over temperature protection will shut down if you exceed the maximum voltage or temperature.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket	0V DC to 30V DC 0V DC to 30V DC	0 amp to 3 amp 0 amp to 3 amp	0 W to 90 W 0 W to 90 W	5 mV DC 5 mV DC	Front	Constant Current, Constant Voltage	5.5"	12.1"	10.5"	Over Temperature, Overcurrent, Overload	7686K29	0000000

With 3 Output Power Connections—Digital Display

Digital displays are often easier to read than analog displays, so you can quickly see if you need to make adjustments.

Overvoltage—Those with overvoltage or over temperature protection will shut down if you exceed the maximum voltage or temperature.

UL Listed and C-UL Listed—UL and C-UL listed power supplies meet U.S. and Canadian safety standards.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type	Certification	Includes		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket	0V DC to 30V DC 0V DC to 30V DC 4V DC to 6.5V DC	0 amp to 2 amp 0 amp to 2 amp 5 amp	0 W to 60 W 0 W to 60 W 20 W to 32.5 W	3 mV DC 3 mV DC 6 mV DC	Front	Constant Current, Constant Voltage	5.7"	10.5"	15"	Overcurrent, Overload, Overvoltage	UL Listed C-UL Listed	Two Pairs of Test Leads (Banana Jack to Alligator Clip)	5775N12	0000000


		Standard Banana Socket	0V DC to 32V DC 0V DC to 32V DC 5V DC	0 amp to 3 amp 0 amp to 3 amp 3 amp	0 W to 96 W 0 W to 96 W 15 W	1 mV DC 1 mV DC 1 mV DC	Front	Constant Current, Constant Voltage	6.7"	9"	12.2"	Overload	—	Two Pairs of Test Leads (Banana Jack to Alligator Clip)	5775N21	000000
		Standard Banana Socket	0V DC to 60V DC 0V DC to 60V DC 2V DC to 6.5V DC	0 amp to 2 amp 0 amp to 2 amp 5 amp	0 W to 120 W 0 W to 120 W 10 W to 32.5 W	3 mV DC 3 mV DC 6 mV DC	Front	Constant Current, Constant Voltage	5.7"	10.5"	15"	Overcurrent, Overload, Overvoltage	—	Two Pairs of Test Leads (Banana Jack to Alligator Clip)	5775N13	000000

With 4 Output Power Connections—Digital Display

Digital displays are often easier to read than analog displays, so you can quickly see if you need to make adjustments.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type	Includes		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket	0V DC to 30V DC 0V DC to 30V DC 3V DC to 6.5V DC 8V DC to 15V DC	0 amp to 5 amp 0 amp to 5 amp 1 amp 3 amp	0 W to 150 W 0 W to 150 W 9 W to 19.5 W 8 W to 15 W	3 mV DC 3 mV DC 6 mV DC 6 mV DC	Front	Constant Current, Constant Voltage	6.3"	10.2"	14.6"	Overcurrent, Overload	Four Pairs of Test Leads (Banana Jack to Alligator Clip)	5773N13	0000000

Bench-Mount Power Supplies

Convert AC voltage into the DC voltages needed to test, design, and prototype a wide variety of electrical circuits and equipment. These power supplies let you adjust the output to the exact voltage needed to power your equipment. You can also set limits on the maximum current to protect your equipment from damage. Keep an eye on the voltage and current drawn by your connected components with the digital display.

Since these use switching regulation, they produce the stated voltage despite fluctuations in your input power and the power being drawn by your system, and won’t become too hot.

When these power supplies convert AC voltage to DC voltage, some noise from the AC voltage will carry into the output. While this won't affect most applications, this noise can interfere with other signals in extremely sensitive applications. The lower the output noise, the less interference it creates.

These power supplies are CE Marked, which means they meet European Union safety standards. If your power supply exceeds the maximum current, voltage, or load, they’ll shut down to protect both the power supply and the connected equipment. Some also protect against excessive temperatures.

Connect the banana plugs on your equipment to the socket output connections.

1 Output Power Connection—Banana Jack Socket

Output Voltage Selector Switch—Power supplies with output voltage selector switch let you choose either an adjustable output, which you control with a dial, or an output fixed at 13.8V DC.

	Output							Front Auxiliary Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Voltage, V DC	Current, amp	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120V AC Input Voltage



		Standard Banana Socket	1V DC to 30V DC	1 amp to 20 amp	1 W to 600 W	50 mV DC	Back	Constant Current, Constant Voltage	1 to 30	1 to 5	3.5"	7.9"	8.5"	Over Temperature, Overcurrent, Overload, Overvoltage	5772N16	0000000


		Standard Banana Socket	13.8V DC, 3V DC to 15V DC	40 amp	552 W, 120 W to 600 W	30 mV DC	Front	Constant Current, Constant Voltage, Output Voltage Selector Switch	—	—	4.4"	11.9"	8.6"	Over Temperature, Overcurrent, Overload, Overvoltage	5772N12	000000


		Single Phase—120/240V AC Input Voltage



				Standard Banana Socket	1V DC to 15V DC	60 amp	60 W to 900 W	40 mV DC	Back	Constant Current, Constant Voltage, Remote Signaling	1 to 15	1 to 3	4.3"	8.7"	14.2"	Over Temperature, Overcurrent, Overload, Overvoltage	5772N13	000000


				Standard Banana Socket	1V DC to 30V DC	30 amp	30 W to 900 W	40 mV DC	Back	Constant Current, Constant Voltage, Remote Signaling	1 to 30	1 to 5	4.3"	8.7"	14.2"	Over Temperature, Overcurrent, Overload, Overvoltage	5772N14	000000

2 Output Power Connections—Banana Jack Socket and USB-A Socket

Image of Product. Front orientation. Power Supplies. Bench-Mount Power Supplies, 2 Output Power Connections.

USB-A—Power supplies with USB-A output connections can also charge phones and other devices with USB-A ports. You can use more than one output at the same time, but you can’t adjust them independently—all outputs are set to the voltage you select.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120V AC Input Voltage



		Standard Banana Socket USB-A Socket	1V DC to 36V DC 5V DC	0 amp to 3 amp 0.4 amp	0 W to 108 W 2 W	50 mV DC 8 mV DC	Front	Constant Current, Constant Voltage	6"	2.9"	9.9"	Over Temperature, Overcurrent, Overload, Overvoltage	5772N11	0000000

3 Output Power Connections—Banana Jack Socket and Lever-Clamp Terminals

Image of Product. Front orientation. Power Supplies. Bench-Mount Power Supplies, 3 Output Power Connections.

	Output
	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Output Connection Location	Output Features	Ht.	Wd.	Dp.	Electrical Protection Type		Each
Single Phase—120/240V AC Input Voltage



		Standard Banana Socket Lever-Clamp Terminal Lever-Clamp Terminal	0V DC to 30V DC 12V DC 5V DC	0 amp to 5 amp 0.5 amp 0.5 amp	0 W to 150 W 6 W 2.5 W	15 mV DC 15 mV DC 15 mV DC	Front	Constant Current, Constant Voltage	5"	8.5"	11.5"	Overcurrent, Overload, Overvoltage	5772N15	0000000

Programmable Bench-Mount Power Supplies

Use your computer to remotely control these power supplies that convert AC voltage to DC voltage for powering electronics from simple prototypes to advanced testing equipment. All of these power supplies include a USB cable and Windows-compatible software to control, monitor, and record the voltage, current, and power outputs of your device. You can also create programs with up to 20 steps that change voltage and current outputs at set times. A selector switch lets you quickly choose up to three defined settings for voltage and current outputs. The power supplies have an auxiliary output connection, but it will take on the same settings as the primary outputs. View the outputs on their digital display.

These power supplies use switching regulation, which means they produce the stated voltage despite fluctuations in your input power and the power being drawn by your system, and they won’t become too hot. If you exceed the maximum voltage, current, load, or temperature, the power supplies will shut down to protect both the power supply and the connected device.

Remote Voltage Sensing—Power supplies with remote voltage sensing check for any drops in the voltage as they send power to a device. If the voltage dips, they can compensate with extra power, so connected devices always receive the correct voltage.

Maximum Output Noise Peak-to-Peak—Maximum output noise is also known as ripple noise. When power supplies convert AC voltage to DC voltage, some noise from the AC voltage will carry into the output. While this noise won't affect most applications, it can interfere with other signals in extremely sensitive audio, measuring, and testing equipment. The lower the output noise, the less interference it creates.

		Output												Front Auxiliary Output
	Display Type	No. of Power Connections	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Ht.	Wd.	Dp.	Electrical Protection Type	Output Connection Location	Output Features	Voltage, V DC	Current, amp		Each
Single Phase—120V AC Input Voltage



		Digital	1	Standard Banana Socket	1V DC to 16V DC	0 amp to 60 amp	0 W to 960 W	50 mV DC	3.5"	7.9"	10.8"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage, Remote Voltage Sensing	1 to 16	0 to 5	5774N14	0000000


		Digital	1	Standard Banana Socket	1V DC to 32V DC	0 amp to 30 amp	0 W to 960 W	50 mV DC	3.5"	7.9"	10.8"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage	1 to 32	0 to 5	5774N15	000000
		Digital	1	Standard Banana Socket	1V DC to 60V DC	0 amp to 15 amp	0 W to 900 W	100 mV DC	3.5"	7.9"	10.8"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage	1 to 60	0 to 5	5774N16	000000


		Single Phase—120, 240V AC Input Voltage



				Digital	1	Standard Banana Socket	1V DC to 18V DC	0 amp to 20 amp	0 W to 360 W	50 mV DC	3.5"	7.9"	8.2"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage	1 to 18	0 to 5	5774N13	000000


				Digital	1	Standard Banana Socket	1V DC to 36V DC	0 amp to 10 amp	0 W to 360 W	50 mV DC	3.5"	7.9"	8.2"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage	1 to 36	0 to 5	5774N12	000000
				Digital	1	Standard Banana Socket	1V DC to 60V DC	0 amp to 5 amp	0 W to 300 W	50 mV DC	3.5"	7.9"	8.2"	Over Temperature, Overcurrent, Overload, Overvoltage	Back	Constant Current, Constant Voltage	1 to 60	0 to 5	5774N11	000000

Rack-Mount Power Supplies

With Digital Display

With Analog Display

Mount these power supplies into standard 19”-wide electronics racks, which can hold multiple electronic devices and keep your benchtop clear. These power supplies change AC voltage to DC voltage to power highly sensitive audio, measuring, and testing devices while keeping electronic interference—known as output or ripple noise—from passing on to the device. The lower the output noise value, the less interference the power supplies will create.

Designed with linear voltage regulation, these power supplies produce the same voltage regardless of changes in the input voltage or the amount of current being drawn. They are also known as linear power supplies. As they send power to a device, they use remote voltage sensing to check for any drops in the voltage. If the voltage dips, they can compensate with extra power, so connected devices always receive the correct voltage.

If you exceed the maximum current or load, these power supplies will shut down to protect both the power supply and the connected device.

View the output on a digital or analog display.

Digital Display—Digital displays are often easier to read than analog displays, so you can quickly see if you need to make adjustments.

Analog Display—Analog displays are better than digital displays for monitoring fast output changes, such as dips and spikes.

		Output												Mounting
	Display Type	No. of Power Connections	Connection	Voltage	Current	Power	Max. Noise Peak-to-Peak	Ht.	Wd.	Dp.	Electrical Protection Type	Output Connection Location	Output Features	Fasteners Included	Number of Holes		Each
Single Phase—120, 240V AC Input Voltage



		Digital	1	Standard Banana Socket	0V DC to 20V DC	0 amp to 25 amp	0 W to 500 W	8 mV DC	5.8"	19"	12.8"	Overcurrent, Overload	Front	Constant Current, Constant Voltage, Remote Voltage Sensing	No	4	7686K41	0000000


		Analog	1	Standard Banana Socket	0V DC to 30V DC	0 amp to 12 amp	0 W to 360 W	8 mV DC	5.8"	19"	13.5"	Overcurrent, Overload	Front	Constant Current, Constant Voltage, Remote Voltage Sensing	No	4	7686K28	000000