The Siemens 3RU2136-4KB00-8K is a high-performance thermal overload relay from the SIRIUS 3RU2 Series, designed to provide dependable protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. This relay features an adjustable current setting range of 62–73 A, Class 10A tripping characteristics, and compatibility with Size S2 contactors, making it ideal for industrial motor control and protection applications.
The relay uses Siemens' proven thermal overload protection technology with inverse-time delayed tripping. It continuously monitors motor current and disconnects the motor when overload conditions persist, helping prevent motor overheating, insulation damage, and costly downtime. The device also incorporates phase-loss sensitivity, reducing the risk of motor damage during single-phasing conditions.
The Variant KB008K is designed for direct contactor mounting on compatible Siemens S2 contactors. Its adjustable current range of 62–73 A makes it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC installations, manufacturing equipment, and industrial automation machinery.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4KB00-8K supports both manual and automatic reset modes, providing flexibility for various industrial applications and maintenance procedures. The relay includes 1 NO + 1 NC auxiliary contacts for signaling, trip indication, and integration into control circuits.
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.
Manufactured according to Siemens' stringent quality standards, the 3RU2136-4KB00-8K delivers long-term reliability in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4KB00-8K |
| SKU | 3RU2136-4KB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | KB008K |
| Current Setting Range | 62–73 A |
| Relay Size | S2 |
| Trip Class | Class 10A |
| 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 |
| Number of Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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