De-energized tap-changers type COT

In the cable-operated tap-changers, the electrical part is separated from the mechanical part. The tap-changer comprises a cable operated mechanism outside the transformer tank, which makes connections to a selected tap of a winding inside the tank. 

COT de-energized tap-changers combine electrical and mechanical reliability with versatility of application and ease of connection to transformer tapping leads. 

• High class material assure the longest lifetime
• Proven solutions with decades of successful field experience.
• Type tested beyond international standards
• High reliability by using few parts and low complexity in design
• Little to no maintenance
• Space saving designs

• Oil-filled three-phase distribution transformers
• Range: Um ≤ 36 kV, Ir ≤ 63 A
• Compliant with IEC standards