Constant Converters | McMaster-Carr

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48 Products

Enclosed Voltage-Stabilizing 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.

Single Phase—Screw-Terminal Input and Output Connection

Image of Product. Front orientation. Transformers. Enclosed Voltage-Stabilizing Transformers.

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



		120/208/240/480	120/208/240	140	4.4"	6"	8 1/2"	Isolated Coils	UL Listed, CSA Certified	7425K33	0000000


		120/208/240/480	120/208/240	250	4.4"	6"	9.7"	Isolated Coils	UL Listed, CSA Certified	7425K34	000000
		120/208/240/480	120/208/240	500	6 1/2"	6.3"	12.3"	Isolated Coils	UL Listed, CSA Certified	7425K35	000000
		120/208/240/480	120/208/240	750	6 1/2"	6.3"	13.3"	Isolated Coils	UL Listed, CSA Certified	7425K36	00000000
		120/208/240/480	120/208/240	1,000	6 1/2"	6.3"	14.2"	Isolated Coils	UL Listed, CSA Certified	7425K37	00000000
		120/208/240/480	120/208/240	1,500	9.9"	9.4"	17.6"	Isolated Coils	UL Listed, CSA Certified	7425K39	00000000
		120/208/240/480	120/208/240	3,000	9.9"	9.4"	19.9"	Isolated Coils	UL Listed, CSA Certified	7425K42	00000000

Enclosed Isolating Transformers

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

Single Phase—Plug Input and Socket Output Connection

NEMA

5-15

Plug

NEMA

5-15

Socket

Constant Voltage—When wired as constant-voltage transformers, they 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	Ht.	Wd.	Dp.	Features		Each
Constant Voltage



		115	115	150	3-Blade Straight	5-15	3-Slot Straight	5-15	3.9"	3.1"	4.2"	Isolated Coils	70245K71	0000000


		115	115	250	3-Blade Straight	5-15	3-Slot Straight	5-15	4.7"	3.8"	4.4"	Isolated Coils	70245K72	000000
		115	115	1,000	3-Blade Straight	5-15	3-Slot Straight	5-15	5.3"	4 1/2"	8.1"	Isolated Coils	70245K74	000000

Single Phase—Wire Leads Input and Output Connection

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

Sealed Cores—Sealed coils and cores prevent corrosion and insulation damage.

	Voltage, V AC
	Input	Output	Power Output, VA	Ht.	Wd.	Dp.	Features	Environment	Enclosure Rating	Certification		Each
Step-Up/Step-Down/Constant Voltage



		120/240	120/240	1,000	10 1/2"	6.1"	5.2"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	6989K21	0000000


		120/240	120/240	2,000	13"	5 1/2"	5.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	6989K23	000000
		120/240	120/240	3,000	11 1/2"	10.3"	7.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	6989K24	000000
		120/240	120/240	5,000	14.4"	10.3"	7.1"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	6989K25	00000000


		Step-Down/Constant Voltage



				240/480	120/240	750	11.3"	5.3"	6 1/2"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	7131K19	000000


				240/480	120/240	1,000	11.3"	5.3"	6 1/2"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	7131K21	000000
				240/480	120/240	1,500	13.3"	6.3"	7.8"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	7131K22	000000
				240/480	120/240	3,000	13.3"	6.3"	7.8"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	7131K23	000000
				240/480	120/240	5,000	15"	10.2"	10.6"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, C-UL Listed	7131K24	000000
				240/480	120/240	10,000	15.2"	13 1/2"	10.8"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, CSA Certified	7131K26	00000000
				240/480	120/240	15,000	20"	10.8"	13.6"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, CSA Certified	7131K27	00000000
				240/480	120/240	25,000	23"	12.1"	14.6"	Isolated Coils, Sealed Coils, Sealed Cores	Outdoor, Wet	NEMA 3R	UL Listed, CSA Certified	7131K28	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

Touch-Safe High-Inrush Panel-Mount Transformers

Prevent accidental contact with live electrical connections—the screw terminals are covered or recessed. These transformers can handle momentary high-inrush current associated with contactors, solenoids, and relays. Also known as control transformers.

Single Phase—Screw-Terminal Input and Output Connection

Image of Product. Front orientation. Transformers. Touch-Safe High-Inrush Panel-Mount Transformers.

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

	Voltage, V AC
	Input	Output	Power Output, VA	Ht.	Wd.	Dp.	Features	Certification		Each
Step-Down/Constant Voltage



		230/460/575	24/115/230	250	4"	4 1/2"	4.8"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T51	0000000


		230/460/575	24/115/230	300	4"	4 1/2"	5.3"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T52	000000
		230/460/575	24/115/230	350	4 1/2"	5.3"	5.4"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T53	000000
		230/460/575	24/115/230	500	4 1/2"	5.3"	6.6"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T54	000000
		230/460/575	24/115/230	750	6"	6.4"	7.4"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T55	000000
		230/460/575	24/115/230	1,000	6.3"	6.8"	7.8"	Covered Terminals	UL Listed, C-UL Listed, CE Marked	6718T56	000000

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	000000