The Siemens 3RU2116-1FB0 is a dependable thermal overload relay from the SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and excessive current draw. Designed for direct mounting on Size S00 Siemens contactors, the relay features an adjustable current setting range of 3.5–5 A and a Class 10 tripping characteristic, making it ideal for motor starters, industrial control panels, and automation systems.
Built on Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and trips when overload conditions persist beyond safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor overheating, winding damage, and insulation deterioration while allowing normal motor starting currents. Integrated phase-failure sensitivity provides additional protection against phase imbalance and phase loss conditions.
The Variant FB0 offers an adjustable overload release setting of 3.5–5 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyors, HVAC equipment, packaging machinery, and industrial automation applications. The compact S00 frame size enables efficient installation in OEM equipment, motor control centers (MCCs), and industrial switchboards.
The relay incorporates 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 and features screw-type terminals for secure wiring. Additional features include a switch position indicator, test function, and STOP button for simplified maintenance and troubleshooting.
Manufactured to Siemens' stringent quality standards, the 3RU2116-1FB0 delivers dependable long-term performance and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1FB0 |
| SKU | 3RU2116-1FB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | FB0 |
| Current Setting Range | 3.5–5 A |
| Relay Size | S00 |
| 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 |
| Rated Insulation Voltage | 690 V |
| Impulse Voltage Resistance | 6 kV |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Operating Temperature | -40°C to +70°C |
| Protection Features | Overload, Phase Failure & Phase Loss Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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