The Siemens 3RU2126-4AB0 is a robust thermal overload relay from the trusted SIRIUS 3RU2 Series, specifically designed to protect three-phase motors against overloads, phase failure, and prolonged overcurrent conditions. Featuring an adjustable current setting range of 11–16 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is an ideal solution for industrial motor protection and automation systems.
Built using Siemens' proven thermal overload technology, the relay continuously monitors motor current and trips when overload conditions persist beyond permissible limits. Its inverse-time delayed tripping mechanism helps prevent motor overheating and insulation damage while allowing normal starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity provides additional protection against single-phasing conditions.
The Variant AB0 offers an adjustable overload release setting of 11–16 A, making it suitable for protecting motors used in pumps, compressors, fans, conveyor systems, HVAC equipment, machine tools, packaging machinery, and general industrial applications. Its compact S0 frame size enables direct mounting onto compatible Siemens contactors, simplifying installation and reducing panel space requirements.
The 3RU2126-4AB0 includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for trip indication, signaling, and control circuit integration. It supports both manual and automatic reset modes, providing flexibility for various operating environments and maintenance practices.
Manufactured according to Siemens' stringent quality standards, this overload relay delivers long-term reliability and dependable motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-4AB0 |
| SKU | 3RU2126-4AB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | AB0 |
| 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 Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Number of Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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