The Siemens 3RU2136-4EB0 is a high-performance thermal overload relay from the SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and excessive current draw. Designed for industrial motor control applications, the relay features an adjustable current setting range of 22–32 A, Class 10 tripping characteristics, and compatibility with Size S2 Siemens contactors. It is designed for direct contactor mounting and supports both manual and automatic reset functions.
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. The relay is also equipped with phase-failure sensitivity for enhanced motor protection.
The Variant EB0 provides an adjustable overload release setting of 22–32 A, making it suitable for protecting motors used in pumps, compressors, conveyors, fans, HVAC equipment, manufacturing machinery, water treatment systems, and industrial automation installations. The compact S2 frame design allows seamless integration into motor starter assemblies and motor control centers.
The 3RU2136-4EB0 includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling and control integration. It features screw-type terminals for both main and auxiliary circuits, ensuring secure wiring and straightforward installation. The relay supports both manual and automatic reset modes, providing flexibility for different operational requirements.
With a rated insulation voltage of 690 V, surge voltage resistance of 6 kV, operating temperature range of -40°C to +70°C, and robust Siemens construction, the relay delivers dependable long-term performance in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4EB0 |
| SKU | 3RU2136-4EB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB0 |
| Current Setting Range | 22–32 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 |
| Rated Operational Voltage | Up to 690 V AC |
| Rated Insulation Voltage | 690 V |
| Surge Voltage Resistance | 6 kV |
| Number of Main Poles | 3 |
| Operating Temperature | -40°C to +70°C |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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