The Siemens 3RU2126-1JB0 is a dependable thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to protect three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Featuring an adjustable current setting range of 4–5.5 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideal for industrial motor control, automation systems, and compact motor starter assemblies.
Using Siemens' proven thermal tripping technology, the relay continuously monitors motor current and disconnects the motor when overload conditions exceed permissible limits. Its inverse-time delayed tripping characteristic helps prevent motor overheating, insulation damage, and premature motor failure while allowing normal motor starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity further enhances motor protection and system reliability.
The Variant JB0 offers an adjustable overload release setting of 4–5.5 A, making it suitable for protecting small and medium-duty motors used in pumps, fans, conveyors, HVAC equipment, compressors, packaging machinery, machine tools, and industrial automation applications. Its compact S0 frame size allows easy installation in motor control centers, switchboards, OEM equipment, and industrial panels.
The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for status indication, signaling, and control circuit integration. It supports both manual and automatic reset modes, offering flexibility for different operational requirements and maintenance procedures.
Designed with screw-type terminals and manufactured to Siemens' stringent quality standards, the 3RU2126-1JB0 delivers long-term reliability, simplified installation, and dependable motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1JB0 |
| SKU | 3RU2126-1JB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | JB0 |
| Current Setting Range | 4–5.5 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 |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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