🔹 Siemens Thermal Overload Relay – 3UA55002R (3UA Series, Variant R)
The Siemens 3UA55002R 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 sensing mechanism, where excessive current heats the bimetal strip, causing it to bend and trip the relay, disconnecting the motor circuit.
This relay is typically used with Siemens contactors in motor starter assemblies, ensuring reliable and economical motor protection in industrial applications. It helps prevent overheating, insulation damage, and unexpected motor failure caused by electrical faults.
The 3UA55002R generally belongs to the upper current range of the 3UA5500 frame (approximately 32–50 A depending on adjustment settings), making it suitable for heavy-duty industrial motors.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA55002R
• Bimetallic overload protection system
• Adjustable current range (approx. 32–50 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
• High durability for industrial applications
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA55002R |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Current Range | ~32 – 50 A (typical frame dependent) |
| Mounting Type | Contactor Mounted / Plug-in |
| Application | Motor Protection |
| Compatible Contactors | Typically Siemens 3TF52 / 3TF53 / 3TF54 series (range dependent) |
| Brand | Siemens |
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