🔹 Siemens Thermal Overload Relay – 3UA55002C (3UA Series, Variant C)
The Siemens 3UA55002C 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 excess motor current heats a bimetal strip, causing it to bend and trip the relay mechanism, disconnecting the motor circuit.
This relay is used with Siemens contactors in motor starter assemblies to ensure safe and reliable protection of industrial motors. It prevents overheating, winding damage, and equipment failure caused by electrical overloads.
The 3UA55002C is typically in the 16–25 A current setting range, making it suitable for medium-to-heavy duty motors used in industrial automation systems.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA55002C
• 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 reliability
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA55002C |
| 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 3TF40 / 3TF41 / 3TF50 series (range dependent) |
| Brand | Siemens |
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