CT operated heavy duty bimetal-relay-3UC6630-5C

Product Description

CT Operated Heavy Duty Bimetal Relay – 3UC6630-5C

The Siemens 3UC6630-5C is a CT-operated heavy-duty bimetal overload relay designed for high-current industrial motor protection in applications with heavy starting loads and long acceleration times. It belongs to the Siemens 3UC6 series, which is specifically engineered for extended range motor protection using current transformer (CT) input, ensuring stable and accurate tripping even under demanding operating conditions.

This relay works on the bimetal thermal principle combined with CT-based current sensing, where motor current is scaled through CTs and used to heat the bimetal strips. In case of overload, phase failure, or current imbalance, the bimetal elements bend and activate the trip mechanism, protecting the motor from overheating and insulation damage.

The 3UC6630-5C is typically used for higher current industrial motor applications (around 160–250 A class range) and is suitable for heavy-duty equipment such as compressors, large pumps, crushers, conveyors, and process industry drives.

🔹 Key Features

• Siemens CT-operated heavy-duty bimetal relay
• Model: 3UC6630-5C
• Part of 3UC6 motor protection relay series
• Designed for heavy starting and continuous-duty motors
• CT-based sensing for extended current range protection
• Protection against overload, phase failure, and current imbalance
• High thermal stability for accurate tripping performance
• Suitable for large industrial motor applications
• Robust and vibration-resistant construction
• Compatible with Siemens contactor-based motor starters
• Reliable operation in continuous industrial environments
• Complies with IEC 60947-4-1 standard