The Siemens 3RU2156-5EB10-8K is a high-performance thermal overload relay from the SIRIUS 3RU2 Series, designed to provide reliable motor protection against overload conditions, phase failure, and excessive current draw. This relay is engineered for industrial motor control applications where dependable protection and operational continuity are critical. It features a current setting range of 140–200 A, Class 10 tripping characteristics, and is suitable for Size S6 contactor systems.
The relay operates on the thermal overload principle, accurately detecting excessive motor current and disconnecting the motor before overheating can cause insulation damage or equipment failure. Its CT-operated design makes it suitable for high-current motor applications commonly found in manufacturing plants, process industries, water treatment facilities, material handling systems, and heavy-duty industrial machinery.
As part of Siemens' trusted SIRIUS motor protection portfolio, the 3RU2156-5EB10-8K offers dependable overload protection while maintaining simple installation and maintenance. The relay supports both manual and automatic reset modes, allowing flexibility according to operational requirements and plant safety procedures.
The relay is designed for separate mounting and utilizes a busbar main circuit connection with screw-terminal auxiliary connections, ensuring secure installation and reliable electrical performance in demanding industrial environments.
Its Class 10 trip characteristic provides effective protection for standard motor starting applications by balancing nuisance-trip prevention with rapid response to sustained overload conditions. This helps extend motor life, reduce maintenance costs, and improve system reliability.
Manufactured to Siemens' stringent quality standards, the 3RU2156-5EB10-8K is widely used in motor starter assemblies, MCC panels, industrial automation systems, pumps, compressors, conveyors, fans, and other heavy-duty motor-driven equipment.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2156-5EB10-8K |
| SKU | 3RU2156-5EB10-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB108K |
| Current Setting Range | 140–200 A |
| Relay Size | S6 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Separate Mounting |
| Main Circuit Connection | Busbar Connection |
| Auxiliary Circuit Connection | Screw Terminal |
| Reset Type | Manual / Automatic |
| Motor Protection Function | Overload Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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