🔹 Siemens Thermal Overload Relay – 3UA50001K (3UA Series, Variant K)
The Siemens 3UA50001K is a thermal overload relay from the 3UA Series designed to protect three-phase induction motors against overload, phase failure, and prolonged overcurrent conditions. It operates on a bimetallic thermal principle, where excess current heats the bimetal strip, causing it to bend and activate the trip mechanism, disconnecting the motor from the supply.
This relay is typically used in combination with Siemens contactors as part of a motor starter assembly. It provides reliable and economical motor protection, helping to prevent overheating, winding damage, and unexpected motor failure due to electrical faults.
The 3UA50001K 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: 3UA50001K
• Bimetallic overload protection system
• Protection against overload and phase failure
• Trip-free mechanism for enhanced safety
• Temperature compensated operation
• Suitable for three-phase motor protection
• Compact design for contactor-based motor starters
• Reliable industrial-grade construction
• Long service life with stable performance
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50001K |
| 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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