🔹 Siemens Thermal Overload Relay – 3UA52002C (3UA Series, Variant C)
The Siemens 3UA52002C 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 trip the relay, disconnecting the motor from the supply.
This relay is typically used with Siemens contactors in motor starter assemblies, providing reliable and economical motor protection in industrial applications. It helps prevent overheating, insulation damage, and unexpected motor failure caused by electrical faults.
The 3UA52002C corresponds to the higher current range of this frame (typically 16–25 A setting range), making it suitable for medium-to-heavy duty industrial motors.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA52002C
• Bimetallic overload protection system
• Adjustable current range (16–25 A)
• Protection against overload and phase failure
• Trip-free mechanism for safe operation
• Temperature compensated for stable performance
• Suitable for three-phase motor protection
• Contactor-mounted compact design
• Industrial-grade durability and long service life
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA52002C |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Current Range | 16 – 25 A |
| Mounting Type | Contactor Mounted / Plug-in |
| Application | Motor Protection |
| Compatible Contactors | Typically Siemens 3TF32 / 3TF33 (range dependent) |
| Brand | Siemens |
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