🔹 Siemens Thermal Overload Relay – 3UA68305F (3UA Series, Variant F)
🔹 Product Description
The Siemens 3UA68305F is a heavy-duty thermal overload relay from the Siemens 3UA Series, designed for high-current industrial motor protection applications. It provides reliable protection against overload, phase failure, and excessive temperature rise, ensuring safe operation of large electrical motors in demanding industrial environments.
This F variant belongs to the 3UA6800 frame range, which is used for very high current motor applications typically found in motor control centers (MCC), steel plants, mining, cement industries, compressors, crushers, and large industrial drive systems.
The relay operates on a bimetal thermal principle (inverse-time protection), where motor current generates heat through internal heater elements. When the temperature exceeds the set limit, the bimetal strips bend and trigger a trip mechanism, disconnecting the motor to prevent damage.
According to Siemens 3UA series structure, the 3UA68 frame is designed for large motors up to 400–630A class applications, often used with CT-based systems in heavy-duty installations.
🔹 Key Features
• Genuine Siemens 3UA Series thermal overload relay
• Model: 3UA68305F
• F variant for ultra heavy-duty motor protection systems
• Designed for high-current / industrial MCC applications
• Thermal bimetal overload protection technology
• Protection against overload and phase failure
• Suitable for large industrial motors and drive systems
• Inverse-time tripping characteristic for accurate protection
• High mechanical and electrical durability
• Compatible with Siemens heavy-duty motor control assemblies
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA68305F |
| Product Type | Thermal Overload Relay (Heavy Duty) |
| Variant | F |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Mounting Type | MCC / Panel Mounted |
| Current Range | ~400 – 630 A (typical 3UA68 frame class) |
| Application | Heavy Industrial Motor Protection |
| Brand | Siemens |
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