🔹 Siemens Thermal Overload Relay – 3UA50000A (3UA Series, Variant A)
The Siemens 3UA50000A is a 3UA Series thermal overload relay designed to provide reliable overload and phase-failure protection for three-phase AC motors. Based on the proven bimetallic operating principle, this relay protects motors against excessive current, overheating, single phasing, and unbalanced load conditions, helping to prevent costly equipment damage and downtime. The 3UA series is widely used in motor starter combinations with Siemens contactors and conforms to international motor protection standards.
The relay operates by monitoring motor current through bimetal elements. In the event of an overload condition, the relay trips and disconnects the motor control circuit, preventing overheating and extending motor life. The 3UA series features Class 10A tripping characteristics, temperature compensation, manual/automatic reset options, and phase-loss protection for dependable industrial performance.
Suitable for use in motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC equipment, machine tools, and manufacturing facilities, the 3UA50000A ensures safe and efficient motor operation.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50000A
• Bimetallic thermal overload protection
• Provides overload and phase-failure protection
• Class 10A tripping characteristic
• Manual and automatic reset capability
• Temperature-compensated operation
• Suitable for three-phase motor protection
• Reliable motor safety and equipment protection
• Compact design for motor starter assemblies
• Long service life and dependable industrial performance
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50000A |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload & Phase Failure Protection |
| Operating Principle | Bimetallic Thermal Relay |
| Trip Class | Class 10A |
| Reset Type | Manual / Automatic |
| Application | Motor Protection |
| Mounting | Contactor Mounted / Independent Mounting |
| Standards | IS/IEC 60947-4-1 |
| Brand | Siemens |
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