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VARIAC Variable Transformers

VARIAC variable transformers, also known as variable autotransformers, are a type of transformer used to vary the output voltage of an AC power source. They are commonly used in applications such as testing equipment, lighting control, and voltage regulation.

The basic principle of a VARIAC transformer is to use a movable brush or wiper to tap into a single winding, allowing the output voltage to be varied between the minimum and maximum levels. The VARIAC transformer is essentially an autotransformer, meaning that the primary and secondary windings are connected in series, and the output voltage is a function of the position of the wiper along the winding.

VARIAC transformers are designed to handle high currents and voltages, and have a low leakage inductance and low output distortion. They are typically used in applications that require precise and continuous voltage control, such as motor speed control, heat treatment, and lighting dimming.

VARIAC transformers are available in various sizes and configurations, ranging from a few hundred watts to several kilowatts. They are designed to operate at frequencies of 50 Hz or 60 Hz, and are available in single-phase or three-phase versions, depending on the application.

Proper selection and use of VARIAC transformers are critical to ensure safe and reliable operation. They are subject to various standards and regulations, such as UL (Underwriters Laboratories) and CE (Conformité Européenne), to ensure their safety and performance. VARIAC transformers should be operated within their rated voltage and current limits, and should be properly grounded and protected from overloading and short-circuiting.

VARIAC Variable Transformers
Part RoHS Manufacturer Description Transformer Type Mounting Feature Manufacturer Series Approvals (V) Output Current-1 Dimensions Maximum Operating Temperature Minimum Operating Temperature Maximum Output Voltage Height Width Diameter Nominal Input Voltage (V) Minimum Input Voltage (V) Length Maximum Input Voltage (V)
221-B by Staco Systems

221-B

Staco Systems

VARIAC; Mounting Feature: PANEL MOUNT; Manufacturer Series: 221-B; Dimensions: D74.68XH53.85 (mm); Height: 53.85 mm; Maximum Input Voltage (V): 120;

VARIAC

PANEL MOUNT

221-B

2.5 A

D74.68XH53.85 (mm)

53.85 mm

74.68 mm

120

MC28F-1 by Spc Technology/ Multicomp

MC28F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 300 mm; Output Current-1: 28 A; Height: 160 mm; Nominal Input Voltage (V): 240;

VARIAC

CHASSIS MOUNT

28 A

270 V

160 mm

300 mm

240

300 mm

SQ1020 by Staco Energy Products

SQ1020

Staco Energy Products

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 107.95 mm; Nominal Input Voltage (V): 240; Maximum Output Voltage: 240 V; Output Current-1: 3.5 A;

VARIAC

CHASSIS MOUNT

3.5 A

240 V

105.5685 mm

107.95 mm

240

135.7122 mm

ESS103 by Block Transformatoren-elektronik

ESS103

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Maximum Operating Temperature: 45 Cel; Nominal Input Voltage (V): 230; Length: 159 mm; Maximum Output Voltage: 250 V;

VARIAC

CHASSIS MOUNT

3.15 A

45 Cel

250 V

84 mm

147 mm

230

159 mm

MCCMV6X-1 by Spc Technology/ Multicomp

MCCMV6X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Output Current-1: 6 A; Length: 165 mm; Height: 125 mm; Width: 165 mm;

VARIAC

CHASSIS MOUNT

6 A

125 mm

165 mm

165 mm

ESS108 by Block Transformatoren-elektronik

ESS108

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 197 mm; Output Current-1: 8 A; Maximum Output Voltage: 250 V; Maximum Operating Temperature: 45 Cel;

VARIAC

CHASSIS MOUNT

8 A

45 Cel

250 V

118 mm

185 mm

230

197 mm

MCCMV3E-1 by Spc Technology/ Multicomp

MCCMV3E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 130 mm; Length: 160 mm; Output Current-1: 3 A; Height: 160 mm;

VARIAC

CHASSIS MOUNT

3 A

160 mm

130 mm

160 mm

MCCMSE10 by Spc Technology/ Multicomp

MCCMSE10

Spc Technology/ Multicomp

VARIAC; Output Current-1: 10 A; Maximum Input Voltage (V): 240;

VARIAC

10 A

240

SQ1210 by Staco Energy Products

SQ1210

Staco Energy Products

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 107.95 mm; Height: 105.5685 mm; Output Current-1: 12 A; Length: 135.7122 mm;

VARIAC

CHASSIS MOUNT

12 A

120 V

105.5685 mm

107.95 mm

120

135.7122 mm

ESS110 by Block Transformatoren-elektronik

ESS110

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Approvals (V): EAC; Length: 197.104 mm; Output Current-1: 10 A; Maximum Output Voltage: 250 V;

VARIAC

CHASSIS MOUNT

EAC

10 A

45 Cel

250 V

118.11 mm

184.912 mm

230

197.104 mm

MCCMV8E-1 by Spc Technology/ Multicomp

MCCMV8E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 175 mm; Output Current-1: 8 A; Height: 170 mm; Length: 175 mm;

VARIAC

CHASSIS MOUNT

8 A

170 mm

175 mm

175 mm

MCCMV4X-1 by Spc Technology/ Multicomp

MCCMV4X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Height: 120 mm; Length: 165 mm; Width: 165 mm; Output Current-1: 4 A;

VARIAC

CHASSIS MOUNT

4 A

120 mm

165 mm

165 mm

ESS104 by Block Transformatoren-elektronik

ESS104

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Nominal Input Voltage (V): 230; Maximum Operating Temperature: 45 Cel; Height: 84 mm; Maximum Output Voltage: 250 V;

VARIAC

CHASSIS MOUNT

4 A

45 Cel

250 V

84 mm

147 mm

230

159 mm

MCCMV8X-1 by Spc Technology/ Multicomp

MCCMV8X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 165 mm; Output Current-1: 8 A; Height: 140 mm; Length: 165 mm;

VARIAC

CHASSIS MOUNT

8 A

140 mm

165 mm

165 mm

MC3F-1 by Spc Technology/ Multicomp

MC3F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 110 mm; Nominal Input Voltage (V): 240; Height: 115 mm; Width: 110 mm;

VARIAC

CHASSIS MOUNT

3 A

270 V

115 mm

110 mm

240

110 mm

ESS9008 by Block Transformatoren-elektronik

ESS9008

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Maximum Output Voltage: 230 V; Maximum Operating Temperature: 45 Cel; Height: 58 mm; Length: 98 mm;

VARIAC

CHASSIS MOUNT

.8 A

45 Cel

230 V

58 mm

94.5 mm

230

98 mm

MC20F-1 by Spc Technology/ Multicomp

MC20F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Nominal Input Voltage (V): 240; Length: 225 mm; Maximum Output Voltage: 270 V; Width: 225 mm;

VARIAC

CHASSIS MOUNT

20 A

270 V

145 mm

225 mm

240

225 mm

ESS102 by Block Transformatoren-elektronik

ESS102

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 125 mm; Length: 137 mm; Maximum Operating Temperature: 45 Cel; Height: 84 mm;

VARIAC

CHASSIS MOUNT

2 A

45 Cel

250 V

84 mm

125 mm

230

137 mm

ESS303 by Block Transformatoren-elektronik

ESS303

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Maximum Output Voltage: 260 V; Height: 84 mm; Width: 147 mm; Maximum Operating Temperature: 45 Cel;

VARIAC

CHASSIS MOUNT

3.15 A

45 Cel

260 V

84 mm

147 mm

230

159 mm

MC1F-1 by Spc Technology/ Multicomp

MC1F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Nominal Input Voltage (V): 240; Width: 83 mm; Maximum Output Voltage: 270 V; Output Current-1: 1 A;

VARIAC

CHASSIS MOUNT

1 A

270 V

99 mm

83 mm

240

99 mm

MC2F-1 by Spc Technology/ Multicomp

MC2F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 110 mm; Length: 110 mm; Maximum Output Voltage: 270 V; Nominal Input Voltage (V): 240;

VARIAC

CHASSIS MOUNT

2 A

270 V

95 mm

110 mm

240

110 mm

MCCMSE5 by Spc Technology/ Multicomp

MCCMSE5

Spc Technology/ Multicomp

VARIAC; Maximum Input Voltage (V): 240; Output Current-1: 5 A;

VARIAC

5 A

240

ESS106 by Block Transformatoren-elektronik

ESS106

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Approvals (V): EAC; Maximum Operating Temperature: 45 Cel; Maximum Output Voltage: 250 V; Width: 147 mm;

VARIAC

CHASSIS MOUNT

EAC

6.3 A

45 Cel

250 V

103.124 mm

147 mm

230

159 mm

MCCMV5E-1 by Spc Technology/ Multicomp

MCCMV5E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Height: 170 mm; Length: 175 mm; Output Current-1: 5 A; Width: 175 mm;

VARIAC

CHASSIS MOUNT

5 A

170 mm

175 mm

175 mm

ESS118 by Block Transformatoren-elektronik

ESS118

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 231 mm; Nominal Input Voltage (V): 230; Maximum Output Voltage: 250 V; Height: 121 mm;

VARIAC

CHASSIS MOUNT

18 A

45 Cel

250 V

121 mm

231 mm

230

243 mm

HSN260/4.5 by Metrel Dd

HSN260/4.5

Metrel Dd

VARIAC; Mounting Feature: CHASSIS MOUNT; Minimum Operating Temperature: -5 Cel; Width: 170 mm; Nominal Input Voltage (V): 230; Length: 220 mm;

VARIAC

CHASSIS MOUNT

4.5 A

40 Cel

-5 Cel

260 V

155 mm

170 mm

230

220 mm

ESS302 by Block Transformatoren-elektronik

ESS302

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Approvals (V): EAC; Output Current-1: 1.8 A; Nominal Input Voltage (V): 230; Width: 124.968 mm;

VARIAC

CHASSIS MOUNT

EAC

1.8 A

45 Cel

260 V

84.074 mm

124.968 mm

230

136.906 mm

MC10F-1 by Spc Technology/ Multicomp

MC10F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Maximum Output Voltage: 270 V; Length: 175 mm; Width: 175 mm; Output Current-1: 10 A;

VARIAC

CHASSIS MOUNT

10 A

270 V

135 mm

175 mm

240

175 mm

MCCMV15E-1 by Spc Technology/ Multicomp

MCCMV15E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 225 mm; Output Current-1: 15 A; Width: 225 mm; Height: 190 mm;

VARIAC

CHASSIS MOUNT

15 A

190 mm

225 mm

225 mm

ESS318 by Block Transformatoren-elektronik

ESS318

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Approvals (V): EAC; Maximum Output Voltage: 260 V; Width: 230.886 mm; Height: 120.904 mm;

VARIAC

CHASSIS MOUNT

EAC

18 A

45 Cel

260 V

120.904 mm

230.886 mm

230

243.078 mm

MCCMCTV5 by Spc Technology/ Multicomp

MCCMCTV5

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Maximum Input Voltage (V): 240; Length: 210 mm; Height: 270 mm; Width: 200 mm;

VARIAC

CHASSIS MOUNT

5 A

270 mm

200 mm

210 mm

240

MC6F-1 by Spc Technology/ Multicomp

MC6F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Output Current-1: 6 A; Maximum Output Voltage: 270 V; Nominal Input Voltage (V): 240; Width: 175 mm;

VARIAC

CHASSIS MOUNT

6 A

270 V

110 mm

175 mm

240

175 mm

MCCMV2E-1 by Spc Technology/ Multicomp

MCCMV2E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Height: 160 mm; Length: 160 mm; Width: 130 mm; Output Current-1: 2 A;

VARIAC

CHASSIS MOUNT

2 A

160 mm

130 mm

160 mm

CMSE3 by Carroll & Meynell Transformers

CMSE3

Carroll & Meynell Transformers

VARIAC; Mounting Feature: CHASSIS MOUNT; Manufacturer Series: CMSE3; Height: 160 mm; Length: 230 mm; Width: 140 mm;

VARIAC

CHASSIS MOUNT

CMSE3

3 A

L230.0XB140.0XH160.0 (mm)

160 mm

140 mm

230 mm

230

ESS9013 by Block Transformatoren-elektronik

ESS9013

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 95 mm; Width: 94.5 mm; Maximum Output Voltage: 230 V; Maximum Operating Temperature: 45 Cel;

VARIAC

CHASSIS MOUNT

1.25 A

45 Cel

230 V

58 mm

94.5 mm

230

95 mm

MCCMV0.7E-1 by Spc Technology/ Multicomp

MCCMV0.7E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Output Current-1: .7 A; Width: 130 mm; Length: 160 mm; Height: 160 mm;

VARIAC

CHASSIS MOUNT

.7 A

160 mm

130 mm

160 mm

ESS120 by Block Transformatoren-elektronik

ESS120

Block Transformatoren-elektronik

VARIAC; Mounting Feature: CHASSIS MOUNT; Nominal Input Voltage (V): 230; Length: 243 mm; Width: 231 mm; Height: 121 mm;

VARIAC

CHASSIS MOUNT

20 A

45 Cel

250 V

121 mm

231 mm

230

243 mm

SQ1010 by Staco Energy Products

SQ1010

Staco Energy Products

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 135.7122 mm; Maximum Output Voltage: 120 V; Width: 107.95 mm; Nominal Input Voltage (V): 120;

VARIAC

CHASSIS MOUNT

10 A

120 V

105.5685 mm

107.95 mm

120

135.7122 mm

MC15F-1 by Spc Technology/ Multicomp

MC15F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 225 mm; Maximum Output Voltage: 270 V; Length: 225 mm; Output Current-1: 15 A;

VARIAC

CHASSIS MOUNT

15 A

270 V

135 mm

225 mm

240

225 mm

MCCMV1X-1 by Spc Technology/ Multicomp

MCCMV1X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Length: 100 mm; Width: 86 mm; Output Current-1: 1 A; Height: 105 mm;

VARIAC

CHASSIS MOUNT

1 A

105 mm

86 mm

100 mm

MCCMV1.5X-1 by Spc Technology/ Multicomp

MCCMV1.5X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 113 mm; Length: 130 mm; Output Current-1: 1.5 A; Height: 127 mm;

VARIAC

CHASSIS MOUNT

1.5 A

127 mm

113 mm

130 mm

MCCMV28E-1 by Spc Technology/ Multicomp

MCCMV28E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Output Current-1: 28 A; Height: 225 mm; Width: 300 mm; Length: 300 mm;

VARIAC

CHASSIS MOUNT

28 A

225 mm

300 mm

300 mm

MCCMV20E-1 by Spc Technology/ Multicomp

MCCMV20E-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Width: 225 mm; Length: 225 mm; Output Current-1: 20 A; Height: 190 mm;

VARIAC

CHASSIS MOUNT

20 A

190 mm

225 mm

225 mm

MC8F-1 by Spc Technology/ Multicomp

MC8F-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Nominal Input Voltage (V): 240; Maximum Output Voltage: 270 V; Width: 175 mm; Output Current-1: 10 A;

VARIAC

CHASSIS MOUNT

10 A

270 V

130 mm

175 mm

240

175 mm

MCCMCTV10 by Spc Technology/ Multicomp

MCCMCTV10

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Height: 270 mm; Maximum Input Voltage (V): 240; Output Current-1: 10 A; Length: 210 mm;

VARIAC

CHASSIS MOUNT

10 A

270 mm

200 mm

210 mm

240

MCCMV2X-1 by Spc Technology/ Multicomp

MCCMV2X-1

Spc Technology/ Multicomp

VARIAC; Mounting Feature: CHASSIS MOUNT; Output Current-1: 2 A; Height: 127 mm; Length: 130 mm; Width: 113 mm;

VARIAC

CHASSIS MOUNT

2 A

127 mm

113 mm

130 mm

CMV8X-1 by Carroll & Meynell Transformers

CMV8X-1

Carroll & Meynell Transformers

VARIAC; Mounting Feature: CHASSIS MOUNT; Manufacturer Series: CMV8X-1; Width: 166 mm; Dimensions: L180.0XB166.0XH140.0 (mm); Length: 180 mm;

VARIAC

CHASSIS MOUNT

CMV8X-1

8 A

L180.0XB166.0XH140.0 (mm)

140 mm

166 mm

180 mm

240

SQ1220 by Staco Energy Products

SQ1220

Staco Energy Products

VARIAC; Mounting Feature: CHASSIS MOUNT; Height: 105.5685 mm; Maximum Output Voltage: 240 V; Length: 135.7122 mm; Output Current-1: 5 A;

VARIAC

CHASSIS MOUNT

5 A

240 V

105.5685 mm

107.95 mm

240

135.7122 mm