mSA-3 Series - Motorised Three Phase Variable Transformers
Comprehensive ranges of enclosed motor-driven three-phase variable transformers in ratings from 10 to 200 Amps.
Supplied as standard in IP20 (NEMA 1 Style) enclosures on castors, with digital voltmeter and ammeter, up/down buttons for output selection, and input circuit breaker protection.
Models are available for 400V (HB), 208V (LB) and 480V (HB-480) nominal site voltages.
Uncased MSA-3 models, without metering and input breakers, are available to special order.
To learn more please check out the listings below –
Proven & Endurable DesignThe basic variable auto-transformer consists of a copper winding on a toroidal core of laminated, grain-oriented, silicon steel. A carbon brush, connected to an output terminal, is rotated over the length of a precision-ground, commutator track to tap off voltage at any turn from zero volts to the maximum output voltage of the winding. Unlike a standard fixed ratio transformer, Sinalda (UK) variable transformers are designed to provide an infinitely variable step-less output voltage that can be adjusted from 0 to 117% of the transformer’s nominal input voltage. Design Features
High Efficiency & Excellent Regulation In contrast to current hungry rheostats and other resistive type voltage controllers, Sinalda (UK) variable auto-transformers have an extremely small power loss, delivering efficiency of 98% or better. Within the transformer ratings, our variable transformers deliver, from no-load to full-load current, negligible variation in output voltage.
Distortion Less Voltage Control
Due to the superiority of the core design and quality of the steel grade utilized, Sinalda (UK) Variable Transformers provide a facsimile of the input waveform with negligible distortion – an essential feature required by many electronic applications.
Low Operating Torque
Due to the ultra-smooth commutator surface, correct and constant contact pressure of the brush on the commutator, combined with the firm positioning of the coil and internal components ensures all Sinalda(UK) Variable Transformers deliver a low operating torque.
Trouble-Free Mechanical Construction for Long Life
All Sinalda (UK) variable transformers are designed for heavy-duty and trouble-free operation. Built to exacting mechanical tolerances, using the finest materials available, the quality of design and build ensures minimal maintenance requirements and enhanced design life.
Negligible Maintenance
When operated in accordance with the operating instructions, the only component that may require periodic inspection and occasional replacement are the brushes. As the brushes are made of a special highly endurable carbon and the design ensures proper contact with the commutator at all times, the need for replacement is infrequent.
Straight forward Install & Use
Whether for bench use or panel mounting, installation, mounting, and use is designed to be easy. Terminals are easily accessible – screw or lug. Output, on manually operated variable transformers, is controlled by either clockwise or anti-clockwise knob rotation.
International Standards Compliance & CE Certification
All Sinalda (UK) variable transformers are designed and manufactured to comply with all relevant International Standards and appropriate European Union CE Directives.
Note: Other voltage configurations available on request/quotation.
Ratings: Currents stated are the maximums at any voltage within the stated output voltage range. Should it be required to run the variable transformer continuously at this current, then we would recommend you select a model with a 20% excess rating (eg for a 20 Amp continuous rating select the 25 Amp model).
Note: Other voltage configurations available on request/quotation.
Ratings: Currents stated are the maximums at any voltage within the stated output voltage range. Should it be required to run the variable transformer continuously at this current, then we would recommend you select a model with a 20% excess rating (eg for a 20 Amp continuous rating select the 25 Amp model).
Note: Other voltage configurations available on request/quotation.
Ratings: Currents stated are the maximums at any voltage within the stated output voltage range. Should it be required to run the variable transformer continuously at this current, then we would recommend you select a model with a 20% excess rating (eg for a 20 Amp continuous rating select the 25 Amp model).
Continuously variable from 0 to 117% of the input voltage
Frequency:
47 to 65Hz
Power Factor:
The Power Factor has no effect on performance providing the variable transformer is being used within its rated capacity
Efficiency:
≥98%
Surge Rating:
4 x max. current rating for 1 second 3 x max. current rating for 3 seconds 1.5 x max. current rating for 15 seconds
Environmental:
Temperature range -15 to 45°C. Derate by 2% for each additional °C up to a max of 60°C Suitable for indoor tropical use up to 95% RH (non-condensing) Maximum altitude 1000m. Derate by 2.5% for each additional 500m
Operator Manual with sections on installation, and maintenance.
CE Certification
mSA-3 Series Three Phase Motorised Variable Transformers comply with the relevant European Union (EU) health, safety, and environmental protection directives and regulations and are duly CE marked.
Sinalda UK Declaration
Low Voltage Directive – 2006/95/EC
Sinalda UK Declaration
RoHS Directive – 2011/65/EC
If you do not find the Motorized Variable Transformer that meets your application’s exact needs, please contact us with your specific detailed requirements.
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