Control Transformers | McMaster-Carr

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99 Products

High-Inrush Panel-Mount Transformers

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. High-Inrush Panel-Mount Transformers, Single Phase—Screw-Terminal Input and Output Connection.

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



		120/240	12/24	50	2.8"	3"	3.3"	UL Listed, C-UL Listed	6988K91	000000


		120/240	12/24	75	2.8"	3"	3.8"	UL Listed, C-UL Listed	6988K92	00000
		120/240	12/24	100	3.1"	3.4"	3.8"	UL Listed, C-UL Listed	6988K93	00000
		120/240	12/24	150	3.4"	3.8"	4.3"	UL Listed, C-UL Listed	6988K94	000000
		120/240	12/24	250	4"	4 1/2"	4 1/2"	UL Listed, C-UL Listed	6988K95	000000
		120/240	12/24	350	4"	4 1/2"	5.3"	UL Listed, CSA Certified	6988K66	000000
		120/240	12/24	500	4.6"	5.3"	5.8"	UL Listed, C-UL Listed	6988K67	000000
		120/240	12/24	750	4.7"	5.3"	7"	UL Listed, C-UL Listed	6988K68	000000
		230/460/575	95/115	50	2.8"	3"	3.3"	UL Listed, C-UL Listed	6988K81	00000
		230/460/575	95/115	100	3"	3.4"	3.8"	UL Listed, C-UL Listed	6988K82	000000
		230/460/575	95/115	150	3.4"	3.8"	4.3"	UL Listed, C-UL Listed	6988K83	000000


		230/460/575	95/115	250	4"	4 1/2"	4.6"	UL Listed, C-UL Listed	6988K84	000000
		230/460/575	95/115	350	4"	4 1/2"	5.3"	UL Listed, C-UL Listed	6988K85	000000
		230/460/575	95/115	500	4.6"	5.3"	5.8"	UL Listed, C-UL Listed	6988K86	000000
		240/480	120	50	2.6"	3"	3.1"	UL Listed, CSA Certified	6988K31	000000
		240/480	120	100	2.9"	3.4"	3.3"	UL Listed, CSA Certified	6988K32	000000
		240/480	120	150	3.2"	3.8"	3.6"	UL Listed, CSA Certified	6988K33	000000
		240/480	120	250	3.2"	3.8"	5.3"	UL Listed, CSA Certified	6988K34	000000
		240/480	120	350	3.8"	4 1/2"	5.1"	UL Listed, CSA Certified	6988K35	000000
		240/480	120	500	3.8"	4 1/2"	5 1/2"	UL Listed, CSA Certified	6988K36	000000
		240/480	120	750	4 1/2"	5.3"	5.6"	UL Listed, CSA Certified	6988K37	000000


		240/480	120	1,000	4 1/2"	5.3"	6.3"	UL Listed, CSA Certified	6988K38	000000
		240/480	120	1,500	6.2"	7.1"	5.9"	UL Listed, CSA Certified	6988K39	000000
		240/480	120	2,000	5.4"	7"	8.4"	UL Listed, C-UL Listed	6988K74	000000

Single Phase—Screw-Terminal Input and Output Connection with Fuse Block

Input and output fuse blocks are built-in and top-mounted to save panel space and allow quick installation.

	Voltage, V AC						For Fuse
	Input	Output	Power Output, VA	Ht.	Wd.	Dp.	Type	Overall Dia.	Certification		Each
Step-Down Voltage



		120/240	12/24	50	4"	3"	3.6"	Midget	13/32"	UL Listed, C-UL Listed	6988K21	0000000


		230/460/575	95/115	100	4.4"	3.4"	4.1"	Midget	13/32"	UL Listed, C-UL Listed	6988K22	000000
		240/480	120	50	4"	3"	3.1"	Midget	13/32"	UL Listed, CSA Certified	6988K51	000000
		240/480	120	100	4.2"	3.4"	3.3"	Midget	13/32"	UL Listed, CSA Certified	6988K52	000000
		240/480	120	150	4 1/2"	3.8"	3.6"	Midget	13/32"	UL Listed, CSA Certified	6988K53	000000
		240/480	120	250	4 1/2"	3.8"	5.3"	Midget	13/32"	UL Listed, CSA Certified	6988K54	000000
		240/480	120	350	5.1"	4 1/2"	5.1"	Midget	13/32"	UL Listed, CSA Certified	6988K55	000000
		240/480	120	500	5.1"	4 1/2"	5 1/2"	Midget	13/32"	UL Listed, CSA Certified	6988K56	000000
		240/480	120	750	5.8"	5.3"	5.6"	Midget	13/32"	UL Listed, CSA Certified	6988K57	000000
		240/480	120	1,000	5.8"	5.3"	6.3"	Midget	13/32"	UL Listed, CSA Certified	6988K58	000000
		240/480	120	1,500	7.7"	6.8"	8.1"	Midget	13/32"	UL Listed, C-UL Listed	6988K23	000000


		240/480	120	2,000	7.7"	6.8"	7.8"	Midget	13/32"	UL Listed, CSA Certified	6988K24	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.

Isolated Coils—Isolated coils protect equipment from input voltage spikes.

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



		120/240	24	50	2.8"	3"	3.3"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K51	000000


		120/240	24	75	2.8"	3"	3.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed	7038K52	000000
		120/240	24	100	3.1"	3.4"	3.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K53	000000
		120/240	24	150	3.4"	3.8"	4.3"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed	7038K54	000000
		120/240	24	250	4"	4 1/2"	4.6"	Covered Terminals, Isolated Coils	UL Listed, CSA Certified, CE Marked	7038K55	000000
		120/240	24	500	4.7"	5.3"	5.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed	7038K57	000000
		120/240	24	1,000	5.7"	7"	6.6"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K59	000000
		240/480	120	50	2.8"	3"	3.3"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K61	00000
		240/480	120	75	2.8"	3"	3.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K62	00000
		240/480	120	100	3.1"	3.4"	3.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K63	00000
		240/480	120	250	4"	4 1/2"	4.6"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K65	000000


		240/480	120	350	4"	4 1/2"	5.3"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed	7038K67	000000
		240/480	120	500	4.7"	5.3"	5.8"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K68	000000
		240/480	120	750	4.7"	5.3"	7"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K69	000000
		240/480	120	1,000	5.7"	7"	6.6"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K71	000000
		240/480	120	1,500	5.7"	7"	7.6"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K72	000000
		240/480	120	2,000	5 1/2"	7"	8.4"	Covered Terminals, Isolated Coils	UL Listed, C-UL Listed, CE Marked	7038K73	000000


		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	000000


				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

Harsh-Environment High-Inrush Panel-Mount Transformers


Transformer with Input and Output Fuse Block	Transformer with Input Fuse Block	Transformer with Output Fuse Block

Sealed coils protect against dust, dirt, oil, and moisture. These transformers can handle momentary high-inrush current associated with contactors, solenoids, and relays. Also known as control transformers. Choose a transformer with multiple output voltages to simultaneously power multiple devices that require different output voltages.

Step-Down Voltage—Input and Output Fuse Block, Sealed Coils—Input and output fuse blocks are built-in and top-mounted to save panel space and allow quick installation.

	Voltage, V AC						For Fuse
	Input	Output	Power Output, VA	Ht.	Wd.	Dp.	UL Class	Type	Overall Dia.	Certification		Each
Single Phase—Screw-Terminal Input and Output Connection







				Step-Down Voltage—Input Fuse Block, Sealed Coils

				120/240	12/24	50	4"	3"	3.8"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K71	000000


				120/240	12/24	75	4"	3"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K72	00000
				120/240	12/24	100	4.4"	3.4"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K73	000000
				120/240	12/24	150	4.7"	3.8"	4.4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K74	000000
				120/240	12/24	250	5.3"	4 1/2"	4.6"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K75	000000
				120/240	12/24	500	6"	5.3"	5.3"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K79	000000




						Step-Down Voltage—Output Fuse Block, Sealed Coils

						120/240	12	50	3.1"	3"	3.8"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K61	00000


						120/240	12	75	3.1"	3"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K62	00000
						120/240	12	100	3 1/2"	3.4"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K63	000000
						120/240	12	150	3.8"	3.8"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K64	000000
						240/480	12	50	3.1"	3"	3.8"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K65	00000
						240/480	12	150	3.8"	3.8"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K68	000000




								Step-Down Voltage—Input and Output Fuse Block, Sealed Coils

								230/460	24/115	50	3.9"	3"	3 1/2"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T71	000000


								230/460	24/115	75	4.2"	3.4"	3.6"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T72	000000
								230/460	24/115	100	4.2"	3.8"	3.6"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T73	000000
								230/460	24/115	150	4.7"	3.8"	4"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T74	000000
								230/460	24/115	200	5.3"	4 1/2"	4.4"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T75	000000
								230/460	24/115	250	4.1"	4 1/2"	4.4"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T76	000000
								230/460	24/115	300	5.9"	5.3"	5.2"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T77	000000
								230/460	24/115	350	5.9"	5.3"	5.2"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T78	000000
								230/460	24/115	500	6"	5.3"	5.7"	CC	Midget	13/32"	UL Listed, C-UL Listed	6718T79	000000
								240/480	120	50	4"	3"	3.8"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K51	00000
								240/480	120	75	4"	3"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K52	00000


								240/480	120	100	4.3"	3.4"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K53	000000
								240/480	120	150	4.7"	3.8"	4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K54	000000
								240/480	120	250	5.3"	4 1/2"	4.4"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K55	000000
								240/480	120	500	6"	5.3"	6.1"	—	Midget	13/32"	UL Listed, C-UL Listed	7034K58	000000

Outlet-Box/Panel-Mount High-Inrush Transformers

Use the included mounting plate to mount these transformers to a panel. They can handle momentary high-inrush current associated with equipment start-up. Also known as control transformers, they are used in heating, ventilation, and air conditioning control circuits.

Single Phase—Wire Leads Input and Output Connection

Image of Product. Front orientation. Transformers. Outlet-Box/Panel-Mount High-Inrush Transformers.

	Voltage, V AC
	Input	Output	Power Output, VA	Wire Lead Lg.	Ht.	Wd.	Dp.	Certification		Each
Step-Down Voltage



		120	24	40	6"	2.8"	3.7"	2 1/2"	UL Recognized Component	7708K21	000000


		120/208/240	24	40	6"	2.8"	3.7"	2 1/2"	UL Recognized Component	7708K22	00000
		208/240	24	40	6"	2.8"	3.7"	2 1/2"	UL Recognized Component	7708K23	00000

DIN-Rail/Panel-Mount High-Inrush Transformers

Use with DIN-rail to install wherever you need these transformers or mount them to a panel. They can handle momentary high-inrush current associated with equipment start-up.

Single Phase—Screw-Terminal Input and Output Connection

	Voltage, V AC
	Input	Output	Power Output, VA	Ht.	Wd.	Dp.	For DIN Rail Size, mm	Certification		Each
Step-Down Voltage



		230	24	63	3 1/2"	3.4"	3.9"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K61	0000000


		230	24	100	4"	3.4"	3.9"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K62	000000
		230	24	160	4.1"	3.9"	4.2"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K63	000000
		230	24	250	4.7"	3.9"	4.2"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K64	000000
		230/460	115	63	3 1/2"	3.4"	3.9"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K71	000000
		230/460	115	100	4"	3.4"	3.9"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K72	000000
		230/460	115	160	4.1"	3.9"	4.2"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K73	000000
		230/460	115	250	4.7"	3.9"	4.2"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K74	00000000
		230/460	115	400	4 1/2"	4.8"	4.8"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K76	00000000
		230/460	115	500	5.3"	4.8"	4.8"	35	UL Recognized Component, C-UL Recognized Component, CE Marked	7962K77	00000000