Sinalda - Model mSA-3 Series - Motorised Three Phase Variable Transformers

Proven & Endurable Design

The 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, Setavolt® 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 input voltage.

Design Features
    
High Efficiency & Excellent Regulation

In contrast to current hungry rheostats and other resistive type voltage controllers, Setavolt® 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, Setavolt® 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 Setavolt® 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 Setavolt® variable transformers are designed and manufactured to comply with all relevant International Standards and appropriate European Union CE Directives.

• Input Voltage:Nominal Voltage +6%
• Output Voltage: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
• Standards Compliance:BS EN 61558-1:2005 + AI:2009 & BS EN 61558-2-13:2009
• CE Conformity:CE Marked – compliant with European Union Directive 2006/95/EC (Low Voltage Directive)
• RoHS Compliance:Fully RoHS Compliant – complaint with European Union Directive 2011/65/EC (RoHS Directive)
• Standard Warranty:1 Year / 12 months from date of supply