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

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Description Prix Primary Voltage Rating Secondary Voltage Rating Power Rating Construction Mounting Type Core Type Termination Type Length Dimensions Width Depth Minimum Operating Frequency Maximum Operating Frequency Minimum Temperature
N° de stock RS 328-8067
Référence fabricantSAT 600
MarqueBlock
93,01 €
Each
Unité
230V ac 115 V ac 600VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
N° de stock RS 738-7846
Référence fabricantAT3 10-20/21-4
MarqueBlock
604,24 €
Each
Unité
200 V ac, 208 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/77 Screw 350mm 350 x 192 x 280mm 192mm 280mm 50Hz 60Hz -
N° de stock RS 738-7818
Référence fabricantAT3 2-69-4
MarqueBlock
195,21 €
Each
Unité
690V ac 400 V ac 2kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/41,5 Screw 220mm 220 x 115 x 175mm 115mm 175mm 50Hz 60Hz -
N° de stock RS 158-7328
Référence fabricantEJET500
MarqueBlock
293,66 €
Each
Unité
230V ac 110 V ac 500VA Enclosed - - Cable 180mm 180 x 126 x 192mm 126mm 192mm 50Hz 60Hz -
N° de stock RS 310-1140
Référence fabricantSAT100
MarqueBlock
65,66 €
Each
Unité
230V ac 115 V ac 100VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
N° de stock RS 738-7880
Référence fabricantAT3 15-44/46-4
MarqueBlock
296,15 €
Each
Unité
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 50Hz 60Hz -
N° de stock RS 436-8861
Référence fabricantCMA10K/FM0
457,63 €
Each
Unité
380 V, 400 V, 415 V 380 V, 400 V, 415 V 10kVA Enclosed Floor Standing - - 420mm 420 x 270 x 325mm 270mm 325mm 50Hz 60Hz -
N° de stock RS 738-7922
Référence fabricantAT3 25-69-4
MarqueBlock
742,99 €
Each
Unité
690V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/73 Screw 480mm 480 x 192 x 395mm 192mm 395mm 50Hz 60Hz -
N° de stock RS 738-7830
Référence fabricantAT3 3,5-48/50-4
MarqueBlock
187,42 €
Each
Unité
480 V ac, 500 V ac 400 V ac 3.5kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/41,5 Screw 220mm 220 x 115 x 175mm 115mm 175mm 50Hz 60Hz -
N° de stock RS 436-8877
Référence fabricantCMA30K/FM0
655,18 €
Each
Unité
380 V, 400 V, 415 V 380 V, 400 V, 415 V 30kVA - - Bobbin - 420mm 420 x 350 x 260mm 350mm 260mm - - -
N° de stock RS 738-7900
Référence fabricantAT3 25-22/23-4
MarqueBlock
1.217,77 €
Each
Unité
220 V ac, 230 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/88 Screw 480mm 480 x 220 x 440mm 220mm 440mm 50Hz 60Hz -
N° de stock RS 738-7896
Référence fabricantAT3 15-69-4
MarqueBlock
690,29 €
Each
Unité
220 V ac, 230 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 180/63 Screw 410mm 410 x 155 x 340mm 155mm 340mm 50Hz 60Hz -
N° de stock RS 738-7916
Référence fabricantAT3 25-44/46-4
MarqueBlock
414,35 €
Each
Unité
440 V ac, 460 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 132/72 Screw 315mm 315 x 185 x 255mm 185mm 255mm 50Hz 60Hz -
N° de stock RS 738-7887
Référence fabricantAT3 15-38/42-4
MarqueBlock
123,13 €
Each
Unité
380 V ac, 415 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/51,1 Screw 220mm 220 x 125 x 175mm 125mm 175mm 50Hz 60Hz -
N° de stock RS 738-7856
Référence fabricantAT3 10-44/46-4
MarqueBlock
256,18 €
Each
Unité
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 50Hz 60Hz -
N° de stock RS 738-7802
Référence fabricantAT3 2-44/46-4
MarqueBlock
123,76 €
Each
Unité
440 V ac, 460 V ac 400 V ac 2kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 75/26,5 Screw 155mm 155 x 95 x 155mm 95mm 155mm 50Hz 60Hz -
N° de stock RS 738-7903
Référence fabricantAT3 25-24/35-4
MarqueBlock
1.027,99 €
Each
Unité
240 V ac, 346 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/73 Screw 480mm 480 x 180 x 430mm 180mm 430mm 50Hz 60Hz -
N° de stock RS 738-7919
Référence fabricantAT3 25-48/50-4
MarqueBlock
543,72 €
Each
Unité
480 V ac, 500 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/77 Screw 350mm 350 x 192 x 280mm 192mm 280mm 50Hz 60Hz -
N° de stock RS 436-9858
Référence fabricantAIM16/8
MarqueBlock
228,54 €
Each
Unité
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Enclosed Panel Mount - Screw 284mm 283 x 200 x 165mm 165mm 200mm 50Hz 60Hz -20°C
N° de stock RS 347-6652
Référence fabricantCM1000/A/US
114,97 €
Each
Unité
230V ac 114.2V ac 1kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -