Thermal Overload Relay Accessory, 3UA Series, Variant D - 3UA62305D

Product Description

🔹 Siemens Thermal Overload Relay – 3UA62305D (3UA Series, Variant D)

🔹 Product Description

The Siemens 3UA62305D is a CT-operated thermal overload relay from the Siemens 3UA Series, designed for heavy-duty industrial motor protection. It provides reliable safeguarding against overload, phase failure, and excessive heating, ensuring safe operation of large motors in demanding industrial environments.

This D variant belongs to the 3UA6230 high-current frame range, which is typically used in motor control centers (MCC panels) and large industrial drive systems. It is generally applied in systems where motors draw very high current, such as crushers, compressors, conveyors, steel plants, and heavy process industries.

The relay operates on a bimetal thermal principle combined with current transformer (CT) input, where the motor current is scaled down through CTs. The resulting heating effect on the bimetal element determines the tripping action. When overload occurs, the bimetal bends and activates a precise trip mechanism to disconnect the motor circuit.

This ensures inverse-time protection, meaning higher overload results in faster tripping, protecting both motor and electrical infrastructure.

🔹 Key Features

• Genuine Siemens 3UA Series thermal overload relay
• Model: 3UA62305D
• D variant for heavy-duty CT-operated systems
• Designed for high-current industrial motor protection
• Thermal bimetal overload protection mechanism
• Protection against overload and phase failure
• Suitable for MCC panels and large motor drive systems
• Reliable inverse-time tripping characteristic
• High durability for continuous industrial operation
• Compatible with Siemens industrial control assemblies