The Siemens 3RU2116-1FB00-8K is a reliable thermal overload relay from the 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 3.5–5 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for industrial motor starters, control panels, HVAC systems, pumps, fans, and automation equipment. Siemens SIRIUS 3RU2 relays are specifically developed for current-dependent motor protection and direct contactor mounting applications.
Built on Siemens’ proven thermal overload protection technology, the relay continuously monitors motor current and disconnects the motor when overload conditions persist beyond safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant FB008K offers an adjustable overload release setting of 3.5–5 A, making it suitable for protecting small and medium-duty motors used in pumps, fans, compressors, conveyor systems, packaging machinery, machine tools, and industrial automation applications. Its compact S00 frame size enables efficient installation in motor control centers, OEM machinery, and industrial switchboards.
The relay supports both manual and automatic reset modes and incorporates 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for trip indication, signaling, and control circuit integration. Screw-type terminals ensure secure electrical connections and simplified installation. The relay is rated for systems up to 690 V AC and includes a switch position indicator and test function for maintenance convenience.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-1FB00-8K delivers dependable long-term performance in demanding industrial environments where continuous motor protection is essential.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1FB00-8K |
| SKU | 3RU2116-1FB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | FB008K |
| 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 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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