The Siemens 3RU2136-4EB00-8K is a reliable thermal overload relay from the trusted SIRIUS 3RU2 Series, engineered to provide dependable protection for 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 23–32 A, Class 10 tripping characteristics, and compatibility with Size S2 contactors. The S2 frame series is designed for contactor mounting and motor protection in demanding industrial environments.
The relay operates using 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 motor overheating, insulation damage, and premature equipment failure while allowing normal motor starting currents. Siemens SIRIUS 3RU2 relays also incorporate phase-failure sensitivity for enhanced motor protection.
The Variant EB008K provides an adjustable overload release setting of 23–32 A, making it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, and industrial automation installations. As part of the S2 relay family, it is designed for direct mounting on compatible Siemens contactors, enabling compact motor starter assemblies.
The 3RU2136-4EB00-8K supports both manual and automatic reset modes, allowing flexibility for different operating requirements and maintenance procedures. Integrated 1 NO + 1 NC auxiliary contacts simplify signaling, monitoring, and control circuit integration within motor control systems. These features are standard across Siemens SIRIUS 3RU2 overload relays.
Designed with screw-type main and auxiliary terminals, the relay ensures secure electrical connections and straightforward installation. Its compact Size S2 construction allows seamless integration into motor control centers (MCCs), switchboards, OEM panels, and industrial automation systems.
Manufactured to Siemens' stringent quality standards, the 3RU2136-4EB00-8K delivers dependable long-term performance in manufacturing plants, water treatment facilities, process industries, material handling systems, and infrastructure projects.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4EB00-8K |
| SKU | 3RU2136-4EB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB008K |
| Current Setting Range | 23–32 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 |
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