The Siemens 3RU2116-1BB00-8K is a compact and dependable thermal overload relay from the proven SIRIUS 3RU2 Series, designed to provide reliable protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. With an adjustable current setting range of 1.4–2.0 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for motor starter combinations, control panels, OEM machinery, and industrial automation systems. Siemens SIRIUS 3RU2 thermal overload relays are specifically engineered for current-dependent motor protection and direct contactor mounting applications.
The relay operates using Siemens' proven inverse-time thermal tripping technology, continuously monitoring motor current and disconnecting the motor when overload conditions exceed permissible limits. This helps prevent motor overheating, insulation damage, winding deterioration, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity provides additional protection against motor damage caused by phase loss or imbalance conditions.
The Variant BB008K provides an adjustable overload release setting of 1.4–2.0 A, making it suitable for protecting small three-phase motors used in pumps, fans, conveyors, compressors, HVAC systems, packaging machinery, and industrial process equipment. Its compact S00 frame size enables efficient installation within motor control centers (MCCs), industrial switchboards, and machine-building applications. S00-frame SIRIUS overload relays support direct integration with compatible Siemens contactors for space-saving motor starter assemblies.
Designed for direct mounting on compatible Siemens contactors, the relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for trip indication, 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. Typical SIRIUS 3RU2 relays also include test functionality and clear trip indication for maintenance convenience.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-1BB00-8K delivers dependable long-term performance and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1BB00-8K |
| SKU | 3RU2116-1BB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | BB008K |
| Current Setting Range | 1.4–2.0 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 |
| Surge Voltage Resistance | 6 kV |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Operating Temperature | -40°C to +70°C |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
No reviews yet.