The Siemens 3RU2136-4AB00-8K is a premium thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Designed for industrial motor control applications, this relay features an adjustable current setting range of 11–16 A, Class 10 tripping characteristics, and compatibility with Size S2 contactors, making it ideal for motor starter assemblies and industrial automation systems.
The relay utilizes 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. The relay also incorporates phase-failure sensitivity, providing enhanced protection against single-phasing conditions.
The Variant AB008K offers an adjustable overload release setting of 11–16 A, making it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, manufacturing machinery, packaging equipment, and industrial automation installations. Designed for direct mounting on compatible Siemens S2 contactors, it enables compact and efficient motor starter configurations.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2136-4AB00-8K supports both manual and automatic reset modes, offering flexibility for different operational requirements and maintenance procedures. Integrated 1 NO + 1 NC auxiliary contacts simplify signaling, monitoring, and control circuit integration.
Designed with screw-type terminals for both main and auxiliary circuits, the relay ensures secure electrical connections and straightforward installation. Its compact Size S2 construction allows seamless integration into motor control centers (MCCs), switchboards, OEM panels, and industrial automation systems.
Manufactured according to Siemens' stringent quality standards, the 3RU2136-4AB00-8K delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4AB00-8K |
| SKU | 3RU2136-4AB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | AB008K |
| Current Setting Range | 11–16 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 Insulation Voltage | 690 V |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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