The Siemens 3RU2136-4DB00-8K is a dependable thermal overload relay from the SIRIUS 3RU2 Series, engineered to protect three-phase motors against overload conditions, phase failure, and excessive current draw. Designed for industrial motor control applications, this relay features an adjustable current setting range of 32–40 A, Class 10 tripping characteristics, and compatibility with Size S2 contactors. The 3RU2136 series is specifically developed for direct contactor mounting and reliable motor protection in industrial environments.
The relay utilizes Siemens' proven thermal overload protection technology, continuously monitoring motor current and disconnecting the motor when overload conditions persist. Its inverse-time delayed tripping characteristic helps prevent overheating, insulation damage, and premature motor failure while allowing normal motor starting currents. Siemens SIRIUS overload relays also provide phase-failure sensitivity for enhanced motor protection.
The Variant DB008K offers an adjustable overload release setting of 32–40 A, making it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, and industrial automation installations. According to the Siemens SIRIUS overload relay selection chart, the DB008K variant falls between the 23–32 A and 36–45 A S2 relay models.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4DB00-8K supports both manual and automatic reset modes, providing flexibility for various operating requirements and maintenance procedures. The relay includes 1 NO + 1 NC auxiliary contacts for signaling, monitoring, and control circuit integration. These features are standard across the SIRIUS 3RU2 thermal overload relay family.
Designed with screw-type main and auxiliary terminals, the relay ensures secure electrical connections and simplified installation. Its compact S2 frame size allows seamless integration into motor starter assemblies, MCC panels, switchboards, and industrial control systems.
Manufactured according to Siemens' stringent quality standards, the 3RU2136-4DB00-8K delivers dependable long-term performance in manufacturing facilities, water treatment plants, process industries, material handling systems, and infrastructure projects.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4DB00-8K |
| SKU | 3RU2136-4DB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB008K |
| Current Setting Range | 32–40 A |
| Relay Size | S2 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
No reviews yet.