CT operated heavy duty bimetal-relay-3UC5830-5E

Product Description

CT Operated Heavy Duty Bimetal Relay – 3UC5830-5E

The Siemens 3UC5830-5E is a CT-operated heavy-duty bimetal overload relay designed for reliable protection of industrial motors under heavy starting and long acceleration conditions. It belongs to the Siemens 3UC5 series, which is specifically developed for applications where motors draw high inrush current and require Class 30-type thermal protection characteristics.

This relay operates on a CT-based bimetal thermal principle, where motor current is sensed through current transformers and converted into proportional heat energy in the bimetal strips. In case of overload, phase failure, or current imbalance, the bimetal elements bend and actuate the tripping mechanism to disconnect the motor, preventing winding damage and overheating.

The 3UC5830-5E is typically used for higher current motor ranges (approx. 25–40 A class depending on CT configuration) and is suitable for demanding industrial applications such as pumps, compressors, conveyors, crushers, and continuous-duty heavy machinery.

🔹 Key Features

• Siemens CT-operated heavy-duty bimetal relay
• Model: 3UC5830-5E
• Part of 3UC5 motor protection relay series
• Designed for heavy starting and long acceleration applications
• CT-operated system for extended current range protection
• Protection against overload, phase loss, and current imbalance
• Suitable for large and medium-heavy industrial motors
• High thermal stability and precise tripping performance
• Robust industrial-grade construction
• Compatible with Siemens contactor-based motor starters
• Reliable operation in continuous-duty environments
• Low maintenance and long service life