Products
-> Standard
Variable Transformers
-> Single Phase Variable Transformers - Varivolt
Range
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Single
Phase Variable Transformers - Varivolt Range
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These variable voltage autotransformers provide a trouble
free and an efficient means of varying/controlling AC
voltages. Variation of the output voltage is achieved
by means of a brush arm with a carbon tip which rotates
around a silver plated commutator.
Rotation of the brush arm is performed manually on
our standard units. They enable the user to vary the
output voltage from zero volts to 100% or 112% of the
line voltage, depending on model and wiring connections
used.
Some models are also supplied as standard with a centre
tap for use in Buck-Boost
systems.
 Standard
range
- Rugged Construction
- Excellent Regulation
- High Efficiency
- No Waveform Distortion
- Silver Plated Commutator
- Overload Capacity
- Low Operating Torque
- Smooth and Linear Output
- Low Magnetising Current
- Negligible Maintenance and trouble free long life
| Voltages : |
Input 230/240V, output 0 to 100% or 112% of input
(Check model drawings for specific capability) |
| Current Capability : |
Up to 28A. Higher on request |
| Terminals : |
Screw or stud |
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Construction Style
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Open |
Encapsulated |
Enclosed |
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Open style variac for
mounting in other equipment |
Windings are encapsulated
for
extra protection, terminals
must be protected from user. |
Enclosed in painted metal
enclosure, rated to IP22 |
If the open type is mounted in one of our standard
WM or FM enclosures (ratings from IP22 to IP66) then
the following options can also be included.
DIMENSIONS
Open Style
Model
|
Current Rating
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WIDTH
(mm)
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DEPTH
(mm)
|
HEIGHT
(mm)
|
Weight
(Kg)
|
Click for Drawing |
|
pdf |
dwg |
CMV0.7F-1
|
0.7A
|
80
|
100
|
115
|
1.0
|
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CMV2F-1
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2A
|
110
|
130
|
140
|
3.0
|
|
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CMV3F-1
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3A
|
110
|
125
|
151
|
3.4
|
|
|
CMV5F-1
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5A
|
175
|
200
|
171
|
8
|
|
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CMV8F-1
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8A
|
175
|
200
|
171
|
8
|
|
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CMV10F-1
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10A
|
175
|
200
|
176
|
8.5
|
|
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CMV15F-1
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15A
|
225
|
250
|
185
|
14.5
|
|
|
CMV20F-1
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20A
|
225
|
250
|
185
|
16
|
|
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CMV28F-1 |
28A |
300 |
360 |
155 |
23 |
|
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Encapsulated Style
Model
|
Current Rating |
Width
(mm)
|
Depth
(mm)
|
Height
(mm)
|
Weight
(Kg)
|
Drawings |
pdf |
dwg |
CMV1X-1
|
1A
|
86
|
99
|
110
|
1.6 |
|
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CMV1.5X-1
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1.5A
|
113
|
130
|
127
|
2.5 |
|
|
CMV2X-1
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2A
|
113
|
130
|
127
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4.0 |
|
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CMV3X-1
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3A
|
113
|
130
|
127
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4.5 |
|
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CMV4X-1
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4A
|
165
|
165
|
120
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5.5 |
|
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CMV6X-1
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6A
|
165
|
190
|
140
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6.0 |
|
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CMV8X-1 |
8A |
165 |
190 |
150 |
7.5 |
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Enclosed Style
Model
|
Current Rating
|
Style |
Width
(mm) |
Depth
(mm) |
Height
(mm) |
Weight
(Kg) |
Drawing |
pdf |
dwg |
CMV0.7E-1
|
0.7
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A |
120 |
95 |
105 |
2.0 |
|
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CMV2E-1
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2A
|
A |
165
|
135
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170
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4.0
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CMV3E-1
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3A
|
A |
160
|
130
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160
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4.5
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|
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CMV5E-1
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5A
|
B |
175
|
210
|
140
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6.5
|
|
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CMV8E-1
|
8A
|
B |
175
|
210
|
170
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8.7
|
|
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CMV10E-1
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10A
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B |
175
|
210
|
170
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9.5
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|
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CMV15E-1
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15A
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B |
225
|
265
|
190
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16
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CMV20E-1
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20A
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B |
225
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265
|
190
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18
|
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CMV28E-1 |
28A |
B |
300 |
370 |
225 |
26 |
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Special Designs
If your requirements vary from any of the above standard
models, we can provide a bespoke item to suit your application.
Such variations may include:-
- Higher currents
- Non Standard Variable Supplies
- Different input voltages
- Different output voltage range
- Motorized drive
- Higher IP rating enclosures
Motor Drive
The motor drive option may be
i) A 230/240V single phase AC synchronous motor (Standard)
ii) A 24V DC motor (By Request)
iii) A 24V DC Stepper motor (By Request)
The motor is coupled to the main rotation shaft by
a gear box. The drive system for types (i) and (ii)
motors are operated by relays(not supplied) that are
closed by the customers control circuitry across the
increase or decrease contacts. Type (iii) motors are
driven directly by the customers control circuitry.
The drive system is fitted with maximum and minimum
end stop micro-switches to stop the motor at the limits
of the brush arm travel
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