Products
-> Standard
Variable Transformers
-> Non-standard Variable Supplies
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Non-standard
Variable Supplies |
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Our variacs are manufactured with standard input voltages
240V single phase and 415V three phase. The output is
variable up to 112% of the input, however to meet the
requirements of other voltages two options are available.
- Step-up / Step-down Transformer second stage
- Custom built variac
Second Stage Transformer
By far the simplest option for producing either higher
voltages or low voltages with high current requirements
is to use a standard range variac to control the input
voltage to a step-up or step-down transformer. The transformer
may be either an autotransformer or an isolation transformer
depending on the application requirements.
Examples
Requirements
|
Typical Solution |
120V SPH input system requiring 0 – 112%
output
or
208V 3PH input system requiring 0 – 112% output
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Use standard 240V variac of same current rating
Use standard 415V variac of same current rating
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Low voltage output requirement less than 50V
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Use step down autotransformer. Reduce current
rating of variac
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Higher output voltage up to 150% of input
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Use step-up autotransformer
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High output voltage greater then 150% of input
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Use step-up isolation transformer |
High power output with small voltage variation
|
Use Buck-Boost system |
| Variable DC supply |
Use Variac with transformer and rectifier |
Custom Built Variacs
 Example
Oil cooled variac with input lead and plug,
output socket with MCB/RCD protection
and 4mm terminals for voltage monitoring
This option usually involves a long lead time but
can be done if circumstances exclude the option for
a second stage transformer as a solution
Options available
- Fuses
- MCB’s and RCD’s
- Plugs and Sockets
- Isolator Switches
- Current and Voltmeters
Contact our technical staff to discuss your requirements
for non-standard variac solutions
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