The Siemens 3RU2136-4HB00-8K is a robust thermal overload relay from the trusted SIRIUS 3RU2 Series, designed to provide dependable protection for three-phase motors against overload conditions, phase failure, and excessive current draw. This relay features an adjustable current setting range of 40–50 A, Class 10 tripping characteristics, and compatibility with Size S2 contactors, making it suitable for a wide range of 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 Variant HB008K is designed for direct contactor mounting and provides an adjustable overload release setting of 40–50 A. It is ideal for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, and industrial automation installations.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4HB00-8K supports both manual and automatic reset modes, offering flexibility for different operating requirements and maintenance procedures. The relay includes 1 NO + 1 NC auxiliary contacts for signaling, monitoring, and control circuit integration.
Designed with screw-type main and auxiliary terminals, the relay ensures secure electrical connections and easy installation. Its compact S2 frame size allows seamless integration into motor starter assemblies, MCC panels, switchboards, and industrial control systems.
The relay incorporates phase-failure sensitivity, helping protect motors from damaging single-phasing conditions. Manufactured according to Siemens' stringent quality standards, it delivers reliable long-term performance in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4HB00-8K |
| SKU | 3RU2136-4HB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | HB008K |
| Current Setting Range | 40–50 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 |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
No reviews yet.