🔹 Siemens Thermal Overload Relay – 3UA50000J (3UA Series, Variant J)
The Siemens 3UA50000J is a 3UA Series thermal overload relay designed to protect three-phase induction motors against overload, phase loss, and prolonged overcurrent conditions. It operates using a bimetallic thermal sensing mechanism, where excessive current causes the bimetal strip to heat up and bend, triggering the trip mechanism and disconnecting the motor circuit to prevent damage.
This relay is commonly used in motor starter assemblies with Siemens contactors, providing reliable and cost-effective motor protection in industrial environments. It helps prevent motor overheating, insulation failure, and downtime caused by electrical faults.
The 3UA50000J is suitable for use in motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC systems, machine tools, and general-purpose industrial motor applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50000J
• Bimetallic thermal overload protection system
• Protection against overload and phase failure
• Trip-free mechanism for safety compliance
• Temperature compensated for stable operation
• Suitable for three-phase motor protection
• Compact design for motor starter integration
• Reliable industrial-grade performance
• Long service life and consistent operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50000J |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal System |
| 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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