🔹 Siemens Thermal Overload Relay – 3UA50001D (3UA Series, Variant D)
The Siemens 3UA50001D is a 3UA Series thermal overload relay designed to protect three-phase induction motors from overload, phase failure, and sustained overcurrent conditions. It operates using a bimetallic thermal sensing mechanism, where excess current heats the bimetal strip, causing it to bend and trip the relay. This action disconnects the motor supply to prevent overheating and potential motor damage.
This relay is commonly used with Siemens contactors in motor starter assemblies, providing reliable and cost-effective motor protection in industrial environments. It helps ensure safe operation by preventing winding damage, insulation failure, and unexpected breakdowns due to electrical faults.
The 3UA50001D is suitable for use in motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC systems, machine tools, and general-purpose industrial motor protection applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50001D
• Bimetallic overload protection system
• Protection against overload and phase failure
• Trip-free safety mechanism for reliability
• Temperature compensated operation for stability
• Suitable for three-phase motor protection
• Compact design for contactor-based starters
• Durable industrial-grade construction
• Long operational life with consistent performance
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50001D |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Application | Motor Protection |
| Mounting Type | Contactor Mounted / Panel Mounted |
| Reset Type | Manual / Automatic (variant dependent) |
| Trip Class | Class 10A (typical for series) |
| Industry Use | Industrial Automation, MCCs, HVAC, Pumps |
| Brand | Siemens |
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