The Siemens 3RU2136-4FB00-8K is a high-quality thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide dependable motor protection against overload conditions, phase failure, and excessive current draw. Featuring an adjustable current setting range of 28–40 A, Class 10 tripping characteristics, and contactor mounting capability, this relay is ideal for protecting industrial motors in demanding applications. Siemens thermal overload relays use inverse-time delayed tripping technology to protect motors from overheating and electrical damage.
Designed for seamless integration with Siemens motor starters and contactors, the FB008K variant offers precise overload protection while allowing normal motor starting currents. Its thermal protection mechanism continuously monitors motor current and disconnects the circuit when overload conditions persist, helping extend motor life and reduce maintenance costs.
The relay incorporates manual and automatic reset functionality, allowing users to configure protection according to operational requirements. Integrated 1 NO + 1 NC auxiliary contacts support status indication and control circuit integration, making the relay suitable for automated industrial systems and motor control centers.
The 3RU2136-4FB00-8K is commonly used in pumps, compressors, fans, conveyors, HVAC systems, manufacturing machinery, and process automation equipment where reliable motor protection is essential. Its compact construction allows efficient installation within MCC panels and industrial control cabinets.
As part of the globally trusted Siemens SIRIUS portfolio, this overload relay delivers long-term operational reliability and compliance with industrial motor protection standards.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4FB00-8K |
| SKU | 3RU2136-4FB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | FB008K |
| Current Setting Range | 28–40 A |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Phase Failure Protection | Yes |
| Protection Function | Motor Overload Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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