🔹 Siemens SIRIUS 3US Thermal Overload Relay – 3US5200-2C8K (Motor Protection Relay)
🔹 Product Description
The Siemens 3US5200-2C8K is a thermal overload relay from the SIRIUS 3US series, designed for reliable protection of low-to-medium current electric motors. It protects motors from overload, phase failure, and overheating, ensuring safe operation in industrial and commercial motor control systems.
This model belongs to the 3US5200 frame range, which is typically used in compact motor starter assemblies for small industrial machines, pumps, HVAC systems, conveyors, and automation panels. It is commonly mounted with Siemens contactors in modular starter configurations.
The relay operates on a bimetal thermal principle, where motor current flows through heater elements that heat up bimetal strips. When the current exceeds the set value for a sustained period, the strip bends and activates the trip mechanism, disconnecting the motor to prevent damage. This provides inverse-time overload protection, meaning higher overload results in faster tripping.
Based on Siemens SIRIUS design standards, this relay offers phase-failure sensitivity and precise current adjustment, making it suitable for continuous motor protection in industrial environments.
🔹 Key Features
• Genuine Siemens SIRIUS 3US series thermal overload relay
• Model: 3US5200-2C8K
• Designed for low-to-medium current motor protection
• Bimetal thermal overload protection technology
• Protection against overload and phase failure
• Suitable for compact motor starter systems
• Compatible with Siemens contactor-based assemblies
• Reliable inverse-time tripping mechanism
• Phase-loss protection for improved motor safety
• Industrial-grade durability and long service life
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3US |
| Model Number | 3US5200-2C8K |
| Product Type | Thermal Overload Relay |
| Protection Type | Overload + Phase Failure Protection |
| Operating Principle | Bimetal Thermal Mechanism |
| Current Range | ~10 – 16 A (typical class for 3US5200 variants) |
| Mounting Type | Contactor Mounted |
| Application | Motor Protection / Industrial Control Panels |
| Brand | Siemens |
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