The Siemens 3RU2136-4GB0 is a high-performance thermal overload relay from the renowned SIRIUS 3RU2 Series, designed to provide reliable motor protection against overload conditions, phase failure, and prolonged overcurrent operation. It features an adjustable current setting range of 36–45 A, Class 10 tripping characteristics, and is designed for direct mounting on Siemens Size S2 contactors, making it suitable for demanding industrial motor control applications.
Built on Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and disconnects 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 also incorporates phase-failure sensitivity, providing additional protection against single-phasing conditions.
The Variant GB0 provides an adjustable overload release setting of 36–45 A and is intended for use with compatible Siemens S2 contactors. It is ideal for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, water treatment systems, and industrial automation installations.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4GB0 supports both manual and automatic reset modes, offering flexibility for different operating and maintenance requirements. The relay includes 1 NO + 1 NC integrated auxiliary contacts for trip indication, monitoring, and control circuit integration.
Designed with screw-type terminals for both main and auxiliary circuits, 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.
With a rated operational voltage of 690 V AC, surge voltage resistance of 6 kV, operating temperature range of -40°C to +70°C, and robust industrial construction, the relay delivers dependable long-term performance in challenging environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4GB0 |
| SKU | 3RU2136-4GB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | GB0 |
| Current Setting Range | 36–45 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 | 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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