The Siemens 3RU2126-4DB0 is a reliable thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide dependable protection for three-phase motors against overload conditions, phase failure, and excessive current draw. Featuring an adjustable current setting range of 21–25 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideal for industrial motor control and automation applications.
Designed for direct contactor mounting, the relay continuously monitors motor current and responds to overload conditions using Siemens' proven inverse-time thermal tripping technology. This protection mechanism helps prevent motor overheating, insulation damage, and costly downtime while permitting normal motor starting currents.
The Variant DB0 offers an adjustable overload release setting of 21–25 A, making it suitable for a wide range of industrial motors used in pumps, compressors, fans, conveyor systems, packaging machinery, HVAC equipment, machine tools, and material handling systems. Its compact S0 frame size enables easy integration into motor starter assemblies, switchboards, and industrial control panels.
The 3RU2126-4DB0 includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for status indication, alarm signaling, and control circuit integration. It supports both manual and automatic reset modes, allowing flexibility based on application requirements and operational procedures.
Manufactured according to Siemens' stringent quality standards, the relay provides excellent operational reliability, long service life, and consistent motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-4DB0 |
| SKU | 3RU2126-4DB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB0 |
| Current Setting Range | 21–25 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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