🔹 Siemens Thermal Overload Relay – 3UA50001B (3UA Series, Variant B)
The Siemens 3UA50001B is a 3UA Series thermal overload relay designed to protect three-phase induction motors from overload, phase loss, and prolonged overcurrent conditions. It uses a bimetallic thermal sensing system, where excessive current heats the bimetal strip, causing it to bend and trip the relay. This action disconnects the motor from the supply, preventing overheating and potential motor damage.
This relay is typically used with Siemens contactors in motor starter assemblies, offering reliable and economical motor protection for industrial applications. It ensures safe motor operation by preventing insulation failure, winding damage, and unexpected breakdowns due to electrical faults.
The 3UA50001B is suitable for motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC systems, machine tools, and general-purpose motor protection applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50001B
• Bimetallic overload protection system
• Protection against overload and phase failure
• Trip-free safety mechanism
• Temperature compensated design for stable operation
• Suitable for three-phase motor protection
• Compact design for contactor-based motor starters
• Reliable industrial-grade performance
• Long service life and consistent operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50001B |
| 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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