The Siemens 3RU2126-4PB00-8K is a premium 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 30–36 A, Class 10 tripping characteristics, and is designed for direct contactor mounting on Size S0 contactors, making it ideal for industrial motor protection applications.
The relay operates using Siemens' proven thermal overload protection principle, 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 motor failure while allowing normal motor starting currents. The relay also provides effective phase-failure protection for enhanced motor safety.
The Variant PB008K offers an adjustable overload release setting of 30–36 A, making it suitable for protecting motors used in pumps, compressors, fans, conveyor systems, HVAC equipment, machine tools, packaging machinery, and industrial automation installations. Its compact S0 frame design allows efficient integration into motor starter assemblies and control panels.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2126-4PB00-8K supports both manual and automatic reset modes, offering flexibility for different operating requirements and maintenance procedures. The relay is designed with screw-type main and auxiliary circuit terminals to ensure secure electrical connections and straightforward installation.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-4PB00-8K delivers reliable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-4PB00-8K |
| SKU | 3RU2126-4PB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | PB008K |
| Current Setting Range | 30–36 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Reset Type | Manual / Automatic |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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