The Siemens 3RU2126-4EB0 is a reliable thermal overload relay from the SIRIUS 3RU2 Series, designed to provide effective motor protection against overload conditions, phase failure, and excessive current draw. The relay features an adjustable current setting range of 27–32 A, Class 10 tripping characteristics, and is designed for direct mounting on Size S0 Siemens contactors, making it 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 and insulation damage while allowing normal motor starting currents. The relay also offers phase-failure sensitivity for enhanced motor protection.
The Variant EB0 provides an adjustable overload release setting of 27–32 A, making it suitable for protecting motors used in pumps, compressors, conveyor systems, fans, HVAC equipment, machine tools, packaging machinery, and industrial automation systems. Its compact S0 frame size enables efficient integration into motor starter assemblies and control panels.
The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact and supports both manual and automatic reset modes, providing flexibility for signaling, monitoring, and control applications. Screw-type terminals ensure secure wiring and simplified installation.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-4EB0 |
| SKU | 3RU2126-4EB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB0 |
| Current Setting Range | 27–32 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 |
| Surge Voltage Resistance | 6 kV |
| Operating Frequency | 50–60 Hz |
| Number of Main Poles | 3 |
| Operating Temperature | -40°C to +70°C |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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