The Siemens 3RU2116-0FB0 is a compact and reliable thermal overload relay from the industry-proven SIRIUS 3RU2 Series, designed to provide effective protection for three-phase motors against overload conditions, phase failure, and overheating. Featuring an adjustable current setting range of 0.35–0.5 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for protecting small motors in industrial automation systems, OEM machinery, HVAC equipment, pumps, fans, and process control applications.
Built on Siemens' inverse-time thermal protection technology, the relay continuously monitors motor current and responds to overload conditions before motor damage can occur. This helps prevent winding failure, insulation deterioration, excessive heat buildup, and costly equipment downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor safety by detecting phase imbalance and phase loss conditions.
The Variant FB0 offers an adjustable overload release setting of 0.35–0.5 A, making it suitable for fractional horsepower and low-current three-phase motors used in conveyors, dosing systems, compact pumps, ventilation equipment, packaging machinery, laboratory equipment, and industrial process automation. Its compact S00 frame size allows efficient installation in motor control centers (MCCs), switchboards, and industrial control panels.
Designed for direct mounting on compatible Siemens contactors, the relay incorporates 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 electrical connections and simplified installation. Additional features include a test function, trip indication, and reliable operation in demanding industrial environments.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-0FB0 delivers dependable long-term performance and precise motor protection for low-current motor applications.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-0FB0 |
| SKU | 3RU2116-0FB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | FB0 |
| Current Setting Range | 0.35–0.5 A |
| Relay Size | S00 |
| 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 | Up to 690 V AC |
| Number of Main Poles | 3 |
| Protection Features | Overload Protection & Phase Failure Detection |
| Frequency | 50/60 Hz |
| Operating Temperature | -40°C to +70°C |
| IP Rating | IP20 |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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