The Siemens 3RU2126-1HB00-8K is a premium thermal overload relay from the trusted SIRIUS 3RU2 Series, designed to provide reliable protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Featuring an adjustable current setting range of 3.5–5 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideal for compact motor starter assemblies, industrial control panels, and automation systems.
Built on Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and disconnects the motor when overload conditions persist beyond safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor overheating, insulation damage, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity provides enhanced protection against single-phasing conditions and improves operational reliability.
The Variant HB008K offers an adjustable overload release setting of 3.5–5 A, making it suitable for protecting small and medium-duty motors used in pumps, fans, compressors, conveyor systems, HVAC equipment, packaging machinery, machine tools, and industrial automation applications. Its compact S0 frame size allows easy installation in motor control centers, OEM equipment, and industrial switchboards.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2126-1HB00-8K supports both manual and automatic reset modes and includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration. Screw-type terminals ensure secure electrical connections and simplified installation.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-1HB00-8K delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1HB00-8K |
| SKU | 3RU2126-1HB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | HB008K |
| Current Setting Range | 3.5–5 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | 690 V |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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