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-240...

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RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-183Brand: RS PRO

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RS Pro
240 V ac
115 V ac
Enclosed
Wall
Terminal Block
-
-
1000VA
105°C
115mm
-
137mm
192 mm
AS/NZS 61558.1, AS/NZS 61558.2.13, CE, IEC/BS/EN 61558-1, IEC/BS/EN 61558-2-13, RoHS
8.8kg
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-199Brand: RS PRO

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RS Pro
240 V ac
115 V ac
Enclosed
Wall
Terminal Block
-
-
1000VA
105°C
115mm
-
137mm
192 mm
IECBSEN 615581, ASNZS 61558.1, CE, ASNZS 61558..1, RoHS
8.8kg
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-195Brand: RS PRO

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RS Pro
240 V ac
115 V ac
Enclosed
Wall
Terminal Block
-
-
1000VA
105°C
115mm
-
137mm
192 mm
ASNZS 61558..1, ASNZS 61558.1, CE, IECBSEN 615581, RoHS
8.8kg
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-202Brand: RS PRO

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RS Pro
240 V ac
115 V ac
Enclosed
Wall
Terminal Block
-
-
1000VA
105°C
115mm
-
137mm
192 mm
ASNZS 61558..1, CE, IECBSEN 615581, RoHS, ASNZS 61558.1
8.8kg
RS PRO Enclosed 1 kVA Auto-Transformer, 220 V ac, 230 V ac, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1 kVA Auto-Transformer, 220 V ac, 230 V ac, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-206Brand: RS PRO

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RS Pro
220 V ac, 230 V ac, 240 V ac
115 V ac
Enclosed
Chassis, Floor Standing, Wall
-
-
-
1kVA
105°C
115mm
10
137mm
192 mm
RoHS
8.8kg
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
RS PRO Enclosed 1000 VA Auto-Transformer, 240 V ac Primary, 115 V ac Secondary
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RS Stock No.: 504-189Brand: RS PRO

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RS Pro
240 V ac
115 V ac
Enclosed
Wall
Terminal Block
-
-
1000VA
105°C
115mm
-
137mm
192 mm
RoHS, IECBSEN 615581, CE, ASNZS 61558..1, ASNZS 61558.1
8.8kg
Carroll & Meynell DMC 2 kVA Auto-Transformer, 230 V ac Primary, 115 V ac Secondary
Carroll & Meynell DMC 2 kVA Auto-Transformer, 230 V ac Primary, 115 V ac Secondary
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RS Stock No.: 347-6668Brand: Carroll & MeynellManufacturers Part No.: CM2000/A/US

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Carroll & Meynell
230 V ac
115 V ac
DMC
-
-
-
-
2kVA
200°C
205mm
-
190mm
260 mm
No
20kg
Block Enclosed Auto-Transformer, 230 V ac Primary, 220 V, 230 V ac, 115 V Secondary
Block Enclosed Auto-Transformer, 230 V ac Primary, 220 V, 230 V ac, 115 V Secondary
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RS Stock No.: 293-2678Brand: BlockManufacturers Part No.: AIM 5.0/2.5

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Block
230 V ac
220 V, 230 V ac, 115 V
Enclosed
Panel
Screw
5 A
Autotransformer For Adjustment of The Voltage On The Input and Output Sides
-
40°C
223mm
AIM
117mm
97 mm
DIN EN 61558-2-13, IEC 61558-2-13, VDE 0570 part 2-13, EN 61558-2-13
5.00kg
Carroll & Meynell DMC 3 kVA Auto-Transformer, 230 V Primary, 114.1 V ac Secondary
Carroll & Meynell DMC 3 kVA Auto-Transformer, 230 V Primary, 114.1 V ac Secondary
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RS Stock No.: 436-8883Brand: Carroll & MeynellManufacturers Part No.: CM3000/A/US

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Carroll & Meynell
230 V
114.1 V ac
DMC
-
-
-
-
3kVA
140°C
205mm
-
190mm
260 mm
No
20kg
Carroll & Meynell Encapsulated 1 kVA Auto-Transformer, 230 V ac Primary, 114.2 V ac Secondary
Carroll & Meynell Encapsulated 1 kVA Auto-Transformer, 230 V ac Primary, 114.2 V ac Secondary
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RS Stock No.: 347-6652Brand: Carroll & MeynellManufacturers Part No.: CM1000/A/US

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Carroll & Meynell
230 V ac
114.2 V ac
Encapsulated
Surface
Plug-In
-
Step Down
1kVA
-
205mm
CM
190mm
260 mm
RoHS
-
Carroll & Meynell 30 kVA Auto-Transformer, 380 V, 415 V, 400 V Primary, 380 V, 400 V, 415 V Secondary
Carroll & Meynell 30 kVA Auto-Transformer, 380 V, 415 V, 400 V Primary, 380 V, 400 V, 415 V Secondary
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RS Stock No.: 436-8877Brand: Carroll & MeynellManufacturers Part No.: CMA30K/FM0

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Carroll & Meynell
380 V, 415 V, 400 V
380 V, 400 V, 415 V
-
-
-
-
-
30kVA
200°C
420mm
CMA
260mm
350 mm
BSEN 61558-2-23
20kg
Carroll & Meynell Enclosed 10 kVA Auto-Transformer, 400 V, 415 V, 380 V Primary, 415 V, 400 V, 380 V Secondary
Carroll & Meynell Enclosed 10 kVA Auto-Transformer, 400 V, 415 V, 380 V Primary, 415 V, 400 V, 380 V Secondary
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RS Stock No.: 436-8861Brand: Carroll & MeynellManufacturers Part No.: CMA10K/FM0

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Carroll & Meynell
400 V, 415 V, 380 V
415 V, 400 V, 380 V
Enclosed
Floor Standing
-
-
-
10kVA
-
420mm
-
325mm
270 mm
RoHS
-
Block Open Frame 2 kVA Auto-Transformer, 480 V, 500 V ac Primary, 400 V ac Secondary
Block Open Frame 2 kVA Auto-Transformer, 480 V, 500 V ac Primary, 400 V ac Secondary
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RS Stock No.: 738-7806Brand: BlockManufacturers Part No.: AT3 2-48/50-4

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Block
480 V, 500 V ac
400 V ac
Open Frame
Wall, Floor Standing, Chassis
Screw
-
-
2kVA
40°C
155mm
AT3
155mm
110 mm
No
6.1kg
Block Open Type 1000 VA Auto-Transformer, 380 V, 415 V Primary, 3 x 400 V Secondary
Block Open Type 1000 VA Auto-Transformer, 380 V, 415 V Primary, 3 x 400 V Secondary
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RS Stock No.: 738-7852Brand: BlockManufacturers Part No.: AT3 10-38/42-4

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Block
380 V, 415 V
3 x 400 V
Open Type
Bracket
Screw
-
-
1000VA
40°C
-
-
-
22 mm
DIN EN 61558-2-13, UL 506, C-UL-US, CSA 22.2, IEC 61558-2-13, VDE 0570 part 2-13, VDE 0532
7.00kg
Block Open Frame 15 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary
Block Open Frame 15 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary
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RS Stock No.: 738-7880Brand: BlockManufacturers Part No.: AT3 15-44/46-4

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Block
460 V ac, 440 V
400 V ac
Open Frame
Wall, Chassis, Floor Standing
Screw
-
-
15kVA
40°C
267mm
-
215mm
150 mm
C-UL-US
20.10kg
Block Open Frame 3.5 kVA Auto-Transformer, 208 V ac Primary, 400 V ac Secondary
Block Open Frame 3.5 kVA Auto-Transformer, 208 V ac Primary, 400 V ac Secondary
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RS Stock No.: 738-7812Brand: BlockManufacturers Part No.: AT3 3,5-20/21-4

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Block
208 V ac
400 V ac
Open Frame
Wall, Floor Standing, Chassis
Screw
-
-
3.5kVA
40°C
267mm
AT3
220mm
150 mm
No
20kg
Block Open Frame 3.5 kVA Auto-Transformer, 230 V ac, 220 V Primary, 400 V ac Secondary
Block Open Frame 3.5 kVA Auto-Transformer, 230 V ac, 220 V Primary, 400 V ac Secondary
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RS Stock No.: 738-7821Brand: BlockManufacturers Part No.: AT3 3,5-22/23-4

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Block
230 V ac, 220 V
400 V ac
Open Frame
Wall, Chassis, Floor Standing
Screw
-
-
3.5kVA
40°C
267mm
-
220mm
150 mm
C-UL-US
20.70kg
Block Open Frame 10 kVA Auto-Transformer, 440 V, 460 V ac Primary, 400 V ac Secondary
Block Open Frame 10 kVA Auto-Transformer, 440 V, 460 V ac Primary, 400 V ac Secondary
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RS Stock No.: 738-7856Brand: BlockManufacturers Part No.: AT3 10-44/46-4

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Block
440 V, 460 V ac
400 V ac
Open Frame
Wall, Floor Standing, Chassis
Screw
-
-
10kVA
40°C
267mm
AT3 10-44/46-4
215mm
125 mm
CSA 22.2, IEC 61558-2-13, VDE 0532, VDE 0570 part 2-13, C-UL-US, UL 506, DIN EN 61558-2-13
14.40kg
Block Open Frame 3.5 kVA Auto-Transformer, 3 x 440 V ac, 460 V ac Primary, 400 V ac Secondary
Block Open Frame 3.5 kVA Auto-Transformer, 3 x 440 V ac, 460 V ac Primary, 400 V ac Secondary
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RS Stock No.: 738-7837Brand: BlockManufacturers Part No.: AT3 3,5-44/46-4

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Block
3 x 440 V ac, 460 V ac
400 V ac
Open Frame
Wall, Chassis, Floor Standing
Screw
-
-
3.5kVA
40°C
155mm
AT3
155mm
110 mm
VDE 0532, DIN EN 61558-2-13, C-UL-US, IEC 61558-2-13, CSA 22.2, UL 506, VDE 0570 part 2-13
6.10kg
Block Open Frame 3.5 kVA Auto-Transformer, 500 V ac, 480 V Primary, 400 V ac Secondary
Block Open Frame 3.5 kVA Auto-Transformer, 500 V ac, 480 V Primary, 400 V ac Secondary
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RS Stock No.: 738-7830Brand: BlockManufacturers Part No.: AT3 3,5-48/50-4

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Block
500 V ac, 480 V
400 V ac
Open Frame
Chassis, Floor Standing, Wall
Screw
-
-
3.5kVA
40°C
220mm
-
175mm
115 mm
DIN EN 61558-2-13, CSA 22.2, VDE 0532, IEC 61558-2-13, C-UL-US, UL 506, VDE 0570 part 2-13
8.7kg