The Siemens 3RU2126-4DB00-8K is a reliable thermal overload relay from the trusted SIRIUS 3RU2 Series, designed to provide effective protection for three-phase motors against overload conditions, phase failure, and excessive current draw. Featuring an adjustable current setting range of 11–16 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideal for industrial motor control and automation 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 motor failure while allowing normal motor starting currents. The relay also incorporates phase-failure sensitivity for enhanced motor protection and operational reliability.
The Variant DB008K provides an adjustable overload release setting of 11–16 A, making it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, machine tools, packaging machinery, and industrial automation installations. Its compact S0 frame size enables efficient integration into motor starter assemblies and control panels.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2126-4DB00-8K supports both manual and automatic reset modes, offering flexibility for different operating requirements and maintenance procedures. The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration.
Designed with screw-type terminals for both main and auxiliary circuits, the relay ensures secure electrical connections and simplified installation. Its compact construction allows seamless integration into motor control centers (MCCs), switchboards, OEM panels, and industrial automation systems.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-4DB00-8K delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-4DB00-8K |
| SKU | 3RU2126-4DB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB008K |
| Current Setting Range | 11–16 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 |
| 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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