🔹 Siemens Thermal Overload Relay – 3UA52002A (3UA Series, Variant A)
The Siemens 3UA52002A 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 works on a bimetallic thermal principle, where rising motor current generates heat in the bimetal strip, causing it to bend and trip the relay, thereby disconnecting the motor circuit and preventing damage.
This relay is commonly used with Siemens contactors in motor starter assemblies, providing reliable and economical protection for industrial motors operating under continuous duty conditions. It helps prevent overheating, insulation failure, and unexpected motor breakdown due to electrical faults.
The 3UA52002A typically corresponds to the 10–16 A current setting range, making it suitable for medium-sized industrial motors used in pumps, compressors, conveyors, HVAC systems, and general automation applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA52002A
• Bimetallic overload protection system
• Adjustable current setting (10–16 A range)
• Protection against overload and phase failure
• Trip-free mechanism for safe operation
• Temperature compensated for stable performance
• Suitable for three-phase motor protection
• Compact contactor-mounted design
• Durable industrial-grade construction
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA52002A |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Current Range | 10 – 16 A |
| Mounting Type | Contactor Mounted / Plug-in |
| Application | Motor Protection |
| Compatible Contactors | Typically Siemens 3TF32 / 3TF33 / 3TF42 (range dependent) |
| Brand | Siemens |
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