The Siemens 3RU2136-4GB00-8K is a reliable thermal overload relay from the SIRIUS 3RU2 Series, designed to provide effective motor protection against overload conditions, phase failure, and prolonged overcurrent operation. This relay 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 a wide range of industrial motor control applications. The 36–45 A range is part of the Siemens 3RU2136 S2-series thermal overload relay family.
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 3RU2 relays are also designed with phase-failure sensitivity to enhance motor safety and operational reliability.
The Variant GB008K is intended for contactor mounting and offers an adjustable overload release setting of 36–45 A. It is ideally suited for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, and industrial automation installations. The compact S2 design enables efficient integration into motor starter assemblies and control panels.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4GB00-8K supports both manual and automatic reset modes, providing flexibility for different operational and maintenance requirements. The relay includes 1 NO + 1 NC auxiliary contacts for signaling, monitoring, and control circuit integration. Similar S2-series overload relays feature these standard protection and control functions.
Designed with screw-type main and auxiliary terminals, the relay ensures secure electrical connections and simplified installation. Its rugged construction and proven Siemens engineering deliver dependable long-term performance in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4GB00-8K |
| SKU | 3RU2136-4GB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | GB008K |
| 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 |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
No reviews yet.