🔹 Siemens Thermal Overload Relay – 3UA50001H (3UA Series, Variant H)
The Siemens 3UA50001H 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 operates using a bimetallic thermal mechanism, where excessive current heats the bimetal strip, causing it to bend and activate the trip mechanism, disconnecting the motor from the supply.
This relay is commonly used in Siemens motor starter assemblies with contactors, providing reliable and cost-effective motor protection in industrial environments. It helps prevent overheating, insulation damage, and unexpected motor failures caused by electrical faults.
The 3UA50001H is suitable for use in motor control centers (MCCs), industrial automation systems, pumps, compressors, conveyors, HVAC systems, machine tools, and general-purpose motor protection applications.
• Genuine Siemens 3UA Series thermal overload relay
• Model Number: 3UA50001H
• Bimetallic overload protection system
• Protection against overload and phase failure
• Trip-free mechanism for safety compliance
• Temperature compensated operation for stable performance
• Suitable for three-phase motor protection
• Compact design for contactor-based starters
• Reliable industrial-grade construction
• Long service life and consistent operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3UA Series |
| Model Number | 3UA50001H |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Application | Motor Protection |
| Mounting Type | Contactor Mounted / Panel Mounted |
| Reset Type | Manual / Automatic (variant dependent) |
| Trip Class | Class 10A (typical for series) |
| Industry Use | Industrial Automation, MCCs, HVAC, Pumps |
| Brand | Siemens |
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