The Siemens 3RU2126-1DB0 is a reliable thermal overload relay from the trusted SIRIUS 3RU2 Series, designed to provide effective protection for three-phase AC motors against overload conditions, phase failure, and excessive current draw. Featuring an adjustable current setting range of 2.2–3.2 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideal for industrial motor control, automation systems, and motor starter assemblies.
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 mechanism helps prevent motor overheating, winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant DB0 provides an adjustable overload release setting of 2.2–3.2 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyors, HVAC systems, packaging machinery, machine tools, and industrial automation equipment. Its compact S0 frame size allows efficient integration into motor control centers (MCCs), OEM machinery, control panels, and industrial switchboards.
The relay is designed for direct contactor mounting and includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration. It supports both manual and automatic reset modes and features screw-type terminals for secure wiring and simplified installation.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-1DB0 delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1DB0 |
| SKU | 3RU2126-1DB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB0 |
| Current Setting Range | 2.2–3.2 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Mounting Type | Direct Contactor Mounting |
| Operating Principle | Thermal |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | Up to 690 V AC |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
No reviews yet.