🔹 Siemens Thermal Overload Relay – 3UA58305B (3UA Series, Variant B)
🔹 Product Description
The Siemens 3UA58305B is a thermal overload relay from the Siemens 3UA Series, designed for reliable motor protection in medium-to-heavy industrial applications. It ensures safe operation of electric motors by protecting them against overload, phase failure, and excessive temperature rise.
This B variant belongs to the 3UA5830 frame range, commonly used in industrial motor control centers (MCC panels) and heavy-duty motor starter systems. It is suitable for continuous-duty industrial machinery such as pumps, compressors, conveyors, crushers, and automation equipment.
The relay operates on a bimetal thermal principle, where excess current generates heat, causing the bimetal strips to bend and activate the trip mechanism. This prevents motor damage and ensures long equipment life.
🔹 Key Features
• Genuine Siemens 3UA Series thermal overload relay
• Model: 3UA58305B
• B variant for industrial motor protection systems
• Bimetal thermal overload protection technology
• Protection against overload and phase failure
• Suitable for MCC panels and motor starter assemblies
• Designed for medium-to-high current applications
• Reliable inverse-time tripping mechanism
• High durability and long operational life
• Compact modular design for easy installation
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA58305B |
| Product Type | Thermal Overload Relay |
| Variant | B |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Mounting Type | Panel / Motor Starter System |
| Current Range | ~25 – 40 A (typical 3UA5830 B variant range) |
| Application | Motor Protection / Industrial Control Panels |
| Brand | Siemens |
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