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Autotransformers

An autotransformer, also known as a step-down transformer, is an electrical transformer with only one winding. The winding has at least 3 taps where electrical connections are made. Autotransformers have the benefit of being small, light and cheap compared to dual-winding transformers.

Autotransformers are used to step up or step down voltages in the 110V-115V-120V range and 220V-230V-240V range. This allows electrical equipment from the US to be fed from higher European voltage.

Applications

• Can be used as a method of soft starting induction motors

• In UK railway applications

• In audio applications, tapped autotransformers are used to adapt speakers to constant-voltage distribution systems

• Power applications to interconnect systems operating at different voltages

• Special autotransformers are used on rural power distribution lines so that customers further away receive the same average voltage as ones nearer to the source

45 Products showing for Autotransformers

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In Stock RS PRO Enclosed 50 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-202 Subtotal (1 unit) Kr. 1 041,99(exc. VAT) Kr. 1 041,99/unit Quantity		240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Wall	-	-	Terminal Block	115mm	-	-	192mm	137mm	50Hz	-	-	50VA	-	60Hz	105°C	-	ASNZS 61558..1, CE, IECBSEN 615581, RoHS, ASNZS 61558.1	8.8kg	-
Temporarily out of stock RS PRO Enclosed 500 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-195 Subtotal (1 unit) Kr. 2 487,20(exc. VAT) Kr. 2 487,20/unit Quantity		240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Wall	-	-	Terminal Block	115mm	-	-	192mm	137mm	50Hz	-	-	500VA	-	60Hz	105°C	-	ASNZS 61558..1, ASNZS 61558.1, CE, IECBSEN 615581, RoHS	8.8kg	-
Temporarily out of stock RS PRO Enclosed 150 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-189 Subtotal (1 unit) Kr. 1 422,59(exc. VAT) Kr. 1 422,59/unit Quantity		240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Wall	-	-	Terminal Block	115mm	-	-	192mm	137mm	50Hz	-	-	150VA	-	60Hz	105°C	-	RoHS, IECBSEN 615581, CE, ASNZS 61558..1, ASNZS 61558.1	8.8kg	-
In Stock RS PRO Enclosed 1 kVA Auto-Transformer, 220 V ac, 230 V ac, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-206 Subtotal (1 unit) Kr. 4 321,25(exc. VAT) Kr. 4 321,25/unit Quantity		220 V ac, 230 V ac, 240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Chassis, Floor Standing, Wall	-	-	-	115mm	-	-	192mm	137mm	50Hz	-	-	1kVA	-	60Hz	105°C	10	RoHS	8.8kg	-
Temporarily out of stock RS PRO Enclosed 100 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-183 Subtotal (1 unit) Kr. 1 189,99(exc. VAT) Kr. 1 189,99/unit Quantity		240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Wall	-	-	Terminal Block	115mm	-	-	192mm	137mm	50Hz	-	-	100VA	-	60Hz	105°C	-	AS/NZS 61558.1, AS/NZS 61558.2.13, CE, IEC/BS/EN 61558-1, IEC/BS/EN 61558-2-13, RoHS	8.8kg	-
In Stock RS PRO Enclosed 250 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary RS Stock No. 504-199 Subtotal (1 unit) Kr. 1 799,65(exc. VAT) Kr. 1 799,65/unit Quantity		240 V ac	-	Auto-Transformer	115 V ac	-	-	Enclosed	Wall	-	-	Terminal Block	115mm	-	-	192mm	137mm	50Hz	-	-	250VA	-	60Hz	105°C	-	IECBSEN 615581, ASNZS 61558.1, CE, ASNZS 61558..1, RoHS	8.8kg	-
In Stock Block Open Frame 2 kVA Auto-Transformer, 230 V ac Primary, 400 V ac Secondary RS Stock No. 738-7795 Mfr. Part No. AT3 2-22/23-4 Subtotal (1 unit) Kr. 4 124,58(exc. VAT) Kr. 4 124,58/unit Quantity	Block	230 V ac	-	Auto-Transformer	400 V ac	-	-	Open Frame	Floor Standing, Chassis, Wall	-	-	Screw	220mm	-	-	125mm	175mm	50Hz	-	-	2kVA	-	60Hz	40°C	AT3	No	10.5g	-
Temporarily out of stock Block Open Frame 3.5 kVA Auto-Transformer, 230 V ac, 220 V Primary, 400 V ac Secondary RS Stock No. 738-7821 Mfr. Part No. AT3 3,5-22/23-4 Subtotal (1 unit) Kr. 6 113,88(exc. VAT) Kr. 6 113,88/unit Quantity	Block	230 V ac, 220 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Wall, Chassis, Floor Standing	-	-	Screw	267mm	-	-	150mm	220mm	50Hz	-	-	3.5kVA	-	60Hz	40°C	-	C-UL-US	20.70kg	-
Temporarily out of stock Block Open Frame 25 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary RS Stock No. 738-7916 Mfr. Part No. AT3 25-44/46-4 Subtotal (1 unit) Kr. 9 216,75(exc. VAT) Kr. 9 216,75/unit Quantity	Block	460 V ac, 440 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Floor Standing, Wall, Chassis	-	-	Screw	315mm	-	-	185mm	255mm	50Hz	-	-	25kVA	-	60Hz	40°C	AT3 25-44/46-4	VDE 0532, CSA 22.2, DIN EN 61558-2-13, UL 506, IEC 61558-2-13, VDE 0570 part 2-13, C-UL-US	30.30kg	-
In Stock Carroll & Meynell 30 kVA Auto-Transformer, 380 V, 415 V, 400 V Primary, 380 V, 400 V, 415 V Secondary RS Stock No. 436-8877 Mfr. Part No. CMA30K/FM0 Subtotal (1 unit) Kr. 19 101,37(exc. VAT) Kr. 19 101,37/unit Quantity	Carroll & Meynell	380 V, 415 V, 400 V	-	Auto-Transformer	380 V, 400 V, 415 V	-	-	-	-	-	-	-	420mm	-	-	350mm	260mm	50Hz	-	-	30kVA	-	60Hz	200°C	CMA	BSEN 61558-2-23	20kg	-
Temporarily out of stock Block Open Frame 15 kVA Auto-Transformer, 220 V, 230 V ac Primary, 400 V ac Secondary RS Stock No. 738-7874 Mfr. Part No. AT3 15-22/23-4 Subtotal (1 unit) Kr. 16 017,94(exc. VAT) Kr. 16 017,94/unit Quantity	Block	220 V, 230 V ac	-	Auto-Transformer	400 V ac	-	-	Open Frame	Floor Standing, Wall, Chassis	-	-	Screw	410mm	-	-	195mm	345mm	50Hz	-	-	15kVA	-	60Hz	40°C	AT3 15-22/23-4	VDE 0532, UL 506, CSA 22.2, IEC 61558-2-13, DIN EN 61558-2-13, C-UL-US, VDE 0570 part 2-13	64.90kg	-
Temporarily out of stock Block Open Frame 15 kVA Auto-Transformer, 500 V ac, 480 V Primary, 400 V ac Secondary RS Stock No. 738-7884 Mfr. Part No. AT3 15-48/50-4 Subtotal (1 unit) Kr. 8 091,97(exc. VAT) Kr. 8 091,97/unit Quantity	Block	500 V ac, 480 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Floor Standing, Wall, Chassis	-	-	Screw	315mm	-	-	165mm	250mm	50Hz	-	-	15kVA	-	60Hz	40°C	-	CSA 22.2, UL 506, VDE 0532, C-UL-US, VDE 0570 part 2-13, IEC 61558-2-13, DIN EN 61558-2-13	29.40kg	-
Stocked by manufacturer Siemens 400 VA Auto-Transformer, 230 V ac Primary, 230 V ac Secondary RS Stock No. 143-934 Mfr. Part No. 3KC9624-1 Subtotal (1 unit) Kr. 11 103,78(exc. VAT) Kr. 11 103,78/unit Quantity	Siemens	230 V ac	-	Auto-Transformer	230 V ac	-	-	-	-	-	-	-	105mm	-	-	96mm	88mm	-	-	-	400VA	-	-	-	-	UKCA CE EAC	3000g	-
In Stock Block Enclosed Auto-Transformer, 230 V ac Primary RS Stock No. 436-9842 Mfr. Part No. AIM10/5 Subtotal (1 unit) Kr. 5 759,70(exc. VAT) Kr. 5 759,70/unit Quantity	Block	230 V ac	-	Auto-Transformer	-	-	-	Enclosed	Panel	-	-	Screw	283mm	10, 5A	-	165mm	200mm	50Hz	-20°C	-	-	Autotransformer For Adjustment of The Voltage On The Input and Output Sides	60Hz	40°C	AIM 10/5	IEC 61558-2-13, VDE 0570 part 2-13, DIN EN 61558-2-13, EN 61558-2-13	12.10kg	-
In Stock Block Open Frame 2 kVA Auto-Transformer, 690 V ac Primary, 400 V ac Secondary RS Stock No. 738-7818 Mfr. Part No. AT3 2-69-4 Subtotal (1 unit) Kr. 4 067,38(exc. VAT) Kr. 4 067,38/unit Quantity	Block	690 V ac	-	Auto-Transformer	400 V ac	-	-	Open Frame	Chassis, Wall, Floor Standing	-	-	Screw	220mm	-	-	115mm	175mm	50Hz	-	-	2kVA	-	60Hz	40°C	AT3	No	10kg	-
Temporarily out of stock Block Open Frame 3.5 kVA Auto-Transformer, 240 V, 346 V ac Primary, 400 V ac Secondary RS Stock No. 738-7824 Mfr. Part No. AT3 3,5-24/35-4 Subtotal (1 unit) Kr. 5 192,04(exc. VAT) Kr. 5 192,04/unit Quantity	Block	240 V, 346 V ac	-	Auto-Transformer	400 V ac	-	-	Open Frame	Wall, Floor Standing, Chassis	-	-	Screw	267mm	-	-	125mm	215mm	50Hz	-	-	3.5kVA	-	60Hz	40°C	-	UL 506, CSA 22.2, VDE 0570 part 2-13, VDE 0532, IEC 61558-2-13, DIN EN 61558-2-13, C-UL-US	14.50kg	-
In Stock Carroll & Meynell Enclosed 10 kVA Auto-Transformer, 400 V, 415 V, 380 V Primary, 415 V, 400 V, 380 V Secondary RS Stock No. 436-8861 Mfr. Part No. CMA10K/FM0 Subtotal (1 unit) Kr. 14 302,86(exc. VAT) Kr. 14 302,86/unit Quantity	Carroll & Meynell	400 V, 415 V, 380 V	-	Auto-Transformer	415 V, 400 V, 380 V	-	-	Enclosed	Floor Standing	-	-	-	420mm	-	-	270mm	325mm	50Hz	-	-	10kVA	-	60Hz	-	-	RoHS	-	-
Temporarily out of stock Block Open Frame 2 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary RS Stock No. 738-7802 Mfr. Part No. AT3 2-44/46-4 Subtotal (1 unit) Kr. 2 375,74(exc. VAT) Kr. 2 375,74/unit Quantity	Block	460 V ac, 440 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Floor Standing, Wall, Chassis	-	-	Screw	155mm	-	-	95mm	155mm	50Hz	-	-	2kVA	-	60Hz	40°C	-	VDE 0532, C-UL-US, VDE 0570 part 2-13, UL 506, IEC 61558-2-13, DIN EN 61558-2-13, CSA 22.2	4.10kg	-
Temporarily out of stock Block Open Frame 15 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary RS Stock No. 738-7880 Mfr. Part No. AT3 15-44/46-4 Subtotal (1 unit) Kr. 6 189,84(exc. VAT) Kr. 6 189,84/unit Quantity	Block	460 V ac, 440 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Wall, Chassis, Floor Standing	-	-	Screw	267mm	-	-	150mm	215mm	50Hz	-	-	15kVA	-	60Hz	40°C	-	C-UL-US	20.10kg	-
Temporarily out of stock Block Open Frame 10 kVA Auto-Transformer, 208 V ac, 200 V Primary, 400 V ac Secondary RS Stock No. 738-7846 Mfr. Part No. AT3 10-20/21-4 Subtotal (1 unit) Kr. 12 970,90(exc. VAT) Kr. 12 970,90/unit Quantity	Block	208 V ac, 200 V	-	Auto-Transformer	400 V ac	-	-	Open Frame	Chassis, Wall, Floor Standing	-	-	Screw	350mm	-	-	192mm	280mm	50Hz	-	-	10kVA	-	60Hz	40°C	-	C-UL-US	47.60kg	-

Autotransformers

45 Products showing for Autotransformers

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