The Siemens 3RU2116-0FB00-8K is a compact and 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 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 used in industrial automation, OEM machinery, control panels, HVAC systems, and process equipment.
Designed for current-dependent motor protection, the relay continuously monitors motor current and responds to overload conditions using Siemens' inverse-time thermal tripping mechanism. This helps prevent motor winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity provides additional protection against motor damage caused by phase imbalance or phase loss.
The Variant FB008K provides an adjustable overload release setting of 0.35–0.5 A, making it suitable for fractional horsepower motors, compact pumps, ventilation systems, conveyors, packaging machinery, dosing equipment, and industrial automation applications. The S00 frame design enables direct mounting on compatible Siemens contactors, creating a compact and space-saving motor starter assembly.
The relay 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 utilizes screw-type terminals for secure wiring and easy installation. The relay is rated for applications up to 690 V AC and is designed for long-term operation in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-0FB00-8K |
| SKU | 3RU2116-0FB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | FB008K |
| 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 | 690 V AC |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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