🔹 Siemens Thermal Overload Relay – 3UA50001J (3UA Series, Variant J)
The Siemens 3UA50001J is a thermal overload relay from the 3UA Series designed to protect three-phase induction motors from overload, phase failure, and sustained overcurrent conditions. It operates on a bimetallic thermal mechanism, where excessive current heats the bimetal strip, causing it to bend and trigger the trip unit, disconnecting the motor from the supply to prevent damage.
This relay is widely used in Siemens motor starter assemblies with contactors, ensuring reliable and economical motor protection in industrial environments. It helps prevent overheating, insulation failure, and unexpected motor breakdowns caused by electrical faults.
The 3UA50001J is suitable for applications such as motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC systems, machine tools, and general-purpose motor protection systems in manufacturing industries.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50001J
• Bimetallic overload protection system
• Protection against overload and phase failure
• Trip-free safety mechanism for reliable operation
• Temperature compensated design for stable performance
• Suitable for three-phase motor protection
• Compact design for contactor-based starters
• Durable industrial-grade construction
• Long service life with consistent operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50001J |
| 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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