🔹 Siemens Thermal Overload Relay – 3UA52001G (3UA Series, Variant G)
The Siemens 3UA52001G is a thermal overload relay from the 3UA Series designed to protect three-phase induction motors against overload, phase failure, and sustained overcurrent conditions. It operates using a bimetallic thermal mechanism, where excess current heats the bimetal strip, causing it to bend and trigger the trip mechanism, disconnecting the motor from the supply.
This relay is commonly used with Siemens contactors in motor starter assemblies, ensuring safe and reliable motor protection in industrial systems. It helps prevent overheating, winding damage, and unexpected motor failure caused by electrical faults.
The 3UA52001G is typically selected for motor starter ranges around 4–6.3A (depending on exact adjustment setting within the 3UA5200 frame series) and is suitable for use in MCC panels, pumps, compressors, conveyors, HVAC systems, and general industrial motor protection applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA52001G
• Bimetallic overload protection system
• Adjustable current protection range (frame-dependent)
• Protection against overload and phase failure
• Trip-free mechanism for safe operation
• Temperature compensated design for stable performance
• Suitable for three-phase motor protection
• Compact design for contactor mounting
• Long service life with industrial reliability
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA52001G |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Typical Current Range | ~4 – 6.3 A (series dependent) |
| Mounting Type | Contactor Mounted / Plug-in |
| Application | Motor Protection |
| Industry Use | Industrial Automation, MCCs, HVAC, Pumps |
| Brand | Siemens |
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