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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-240...

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RS Pro
220 V ac, 230 V ac, 240 V ac
115V ac
100VA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
65mm
65 x 115 x 78mm
115mm
78mm
0.934
-
-

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RS Pro
220 V ac, 230 V ac, 240 V ac
115V ac
250VA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
81mm
81 x 136 x 100mm
136mm
100mm
0.947
-
-

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RS Pro
220 V ac, 230 V ac, 240 V ac
115V ac
500VA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
98mm
98 x 145 x 118mm
145mm
118mm
0.958
-
-
RS PRO 50VA Enclosed Autotransformer, 230V ac Primary, 115V ac Secondary
RS Stock No. 504-202
Brand RS PRO

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RS Pro
230V ac
115V ac
50VA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
58mm
58 x 63 x 70mm
63mm
70mm
0.922
-
-

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RS Pro
220 V ac, 230 V ac, 240 V ac
115V ac
150VA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
73mm
73 x 120 x 89mm
120mm
89mm
0.942
-
-

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RS Pro
220 V ac, 230 V ac, 240 V ac
115V ac
1kVA
Enclosed
Chassis Mount, Floor Standing, Wall Mount
-
-
115mm
115 x 192 x 137mm
192mm
137mm
0.96
-
-
Carroll & Meynell 2kVA Autotransformer, 230V ac Primary, 115V ac Secondary, Bobbin Core
RS Stock No. 347-6668
Brand Carroll & Meynell
Manufacturers Part No. CM2000/A/US

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Carroll & Meynell
230V ac
115V ac
2kVA
-
-
Bobbin
-
205mm
205 x 195 x 260mm
260mm
190mm
-
-
-
Block Enclosed Autotransformer, 115 V ac, 230 V ac Primary, 115 V ac, 220 V ac, 230 V ac Secondary
RS Stock No. 293-2678
Brand Block
Manufacturers Part No. AIM 5.0/2.5

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Block
115 V ac, 230 V ac
115 V ac, 220 V ac, 230 V ac
-
Enclosed
Panel Mount
-
Screw
223mm
223 x 97 x 117mm
97mm
117mm
-
2.5 A, 5.0 A
-
Carroll & Meynell 3kVA Autotransformer, 230V Primary, 114.1V ac Secondary, Bobbin Core
RS Stock No. 436-8883
Brand Carroll & Meynell
Manufacturers Part No. CM3000/A/US

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Carroll & Meynell
230V
114.1V ac
3kVA
-
-
Bobbin
-
205mm
205 x 195 x 260mm
260mm
190mm
-
-
-
Carroll & Meynell 1kVA Autotransformer, 230V ac Primary, 114.2V ac Secondary, Bobbin Core
RS Stock No. 347-6652
Brand Carroll & Meynell
Manufacturers Part No. CM1000/A/US

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Carroll & Meynell
230V ac
114.2V ac
1kVA
-
-
Bobbin
-
205mm
205 x 195 x 260mm
260mm
190mm
-
-
Thermal Cutout
Carroll & Meynell 30kVA Autotransformer, 380 V, 400 V, 415 V Primary, 380 V, 400 V, 415 V Secondary, Bobbin Core
RS Stock No. 436-8877
Brand Carroll & Meynell
Manufacturers Part No. CMA30K/FM0

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Carroll & Meynell
380 V, 400 V, 415 V
380 V, 400 V, 415 V
30kVA
-
-
Bobbin
-
420mm
420 x 350 x 260mm
350mm
260mm
-
-
-
Block 100VA Autotransformer, 230V ac Primary, 115 V ac Secondary
RS Stock No. 310-1140
Brand Block
Manufacturers Part No. SAT100

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Block
230V ac
115 V ac
100VA
-
-
-
-
166mm
166 x 76 x 77mm
76mm
77mm
-
-
-
Carroll & Meynell 10kVA Enclosed Autotransformer, 380 V, 400 V, 415 V Primary, 380 V, 400 V, 415 V Secondary
RS Stock No. 436-8861
Brand Carroll & Meynell
Manufacturers Part No. CMA10K/FM0

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Carroll & Meynell
380 V, 400 V, 415 V
380 V, 400 V, 415 V
10kVA
Enclosed
Floor Standing
-
-
420mm
420 x 270 x 325mm
270mm
325mm
-
-
-
Block 2kVA Open Frame Autotransformer, 480 V ac, 500 V ac Primary, 400 V ac Secondary, 3 UI 75/41,5 Core
RS Stock No. 738-7806
Brand Block
Manufacturers Part No. AT3 2-48/50-4

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Block
480 V ac, 500 V ac
400 V ac
2kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 75/41,5
Screw
155mm
155 x 110 x 155mm
110mm
155mm
-
-
-
Block 10kVA Open Frame Autotransformer, 380 V ac, 415 V ac Primary, 400 V ac Secondary, 3 UI 90/31,5 Core
RS Stock No. 738-7852
Brand Block
Manufacturers Part No. AT3 10-38/42-4

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Block
380 V ac, 415 V ac
400 V ac
10kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 90/31,5
Screw
220mm
220 x 105 x 175mm
105mm
175mm
-
-
-
Block 15kVA Open Frame Autotransformer, 440 V ac, 460 V ac Primary, 400 V ac Secondary, 3 UI 114/64 Core
RS Stock No. 738-7880
Brand Block
Manufacturers Part No. AT3 15-44/46-4

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Block
440 V ac, 460 V ac
400 V ac
15kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 114/64
Screw
267mm
267 x 150 x 215mm
150mm
215mm
-
-
-
Block 3.5kVA Open Frame Autotransformer, 200 V ac, 208 V ac Primary, 400 V ac Secondary, 3 UI 114/64 Core
RS Stock No. 738-7812
Brand Block
Manufacturers Part No. AT3 3,5-20/21-4

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Block
200 V ac, 208 V ac
400 V ac
3.5kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 114/64
Screw
267mm
267 x 150 x 220mm
150mm
220mm
-
-
-
Block 3.5kVA Open Frame Autotransformer, 220 V ac, 230 V ac Primary, 400 V ac Secondary, 3 UI 114/64 Core
RS Stock No. 738-7821
Brand Block
Manufacturers Part No. AT3 3,5-22/23-4

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Block
220 V ac, 230 V ac
400 V ac
3.5kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 114/64
Screw
267mm
267 x 150 x 220mm
150mm
220mm
-
-
-
Block 10kVA Open Frame Autotransformer, 440 V ac, 460 V ac Primary, 400 V ac Secondary, 3 UI 114/40 Core
RS Stock No. 738-7856
Brand Block
Manufacturers Part No. AT3 10-44/46-4

P.O.A

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Block
440 V ac, 460 V ac
400 V ac
10kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 114/40
Screw
267mm
267 x 125 x 215mm
125mm
215mm
-
-
-
Block 3.5 kVA, 10 kVA Open Frame Autotransformer, 460 V ac, 3 x 440 V ac Primary, 400V ac Secondary, 3 UI 75/41,5 Core
RS Stock No. 738-7837
Brand Block
Manufacturers Part No. AT3 3,5-44/46-4

P.O.A

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Block
460 V ac, 3 x 440 V ac
400V ac
3.5 kVA, 10 kVA
Open Frame
Chassis Mount, Floor Standing, Wall Mount
3 UI 75/41,5
Screw
155mm
155 x 110 x 155mm
110mm
155mm
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-
-