The Siemens 3RU2156-5DW10-8K is a premium thermal overload relay from the SIRIUS 3RU2 Series, engineered to provide reliable protection for industrial motors against overload conditions, phase failure, and prolonged overcurrent operation. Designed for demanding motor control applications, this relay offers a current setting range of 110–160 A, Class 10 tripping characteristics, and compatibility with Size S6 motor starter systems.
The relay operates using the proven thermal overload protection principle, monitoring motor current and disconnecting the motor before excessive heating can damage windings or insulation. This helps extend motor life, improve equipment reliability, and reduce maintenance costs in industrial environments.
The 3RU2156-5DW10-8K is a CT-operated overload relay with a straight-through transformer design, making it suitable for higher-current motor applications. Siemens identifies this variant as part of the S6 frame relay family intended for motors with a current setting range of 110–160 A and approximately 75 kW motor ratings under standard operating conditions.
As part of the trusted SIRIUS motor protection portfolio, the relay supports both manual and automatic reset modes, allowing users to configure the protection system according to operational requirements and plant safety procedures. This flexibility makes it suitable for a wide variety of industrial motor control applications.
The relay is designed for separate mounting installations, featuring a busbar main circuit connection and screw-terminal auxiliary circuits. This configuration provides secure electrical connections and simplifies integration into motor control centers, switchboards, and industrial automation systems.
Its Class 10 trip characteristic offers dependable protection for standard motor starting applications by providing an optimal balance between startup tolerance and overload protection. The relay responds quickly to sustained overload conditions while minimizing nuisance tripping during normal motor operation.
Manufactured according to Siemens' rigorous quality standards, the 3RU2156-5DW10-8K is widely used in pumps, compressors, conveyor systems, HVAC equipment, water treatment facilities, manufacturing plants, and industrial automation installations where reliable motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2156-5DW10-8K |
| SKU | 3RU2156-5DW10-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DW108K |
| Current Setting Range | 110–160 A |
| Relay Size | S6 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Design Type | CT Operated, Straight Through Transformer |
| 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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