The Siemens 3RU2116-1KB00-8K is a high-quality thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and excessive current draw. Featuring an adjustable current setting range of 9–12.5 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideally suited for industrial motor control systems, automation equipment, and compact motor starter assemblies. The SIRIUS 3RU2 range is specifically designed 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 exceed safe operating limits. Its inverse-time delayed tripping characteristic helps prevent motor overheating, insulation damage, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant KB008K provides an adjustable overload release setting of 9–12.5 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyor systems, HVAC equipment, packaging machinery, machine tools, and industrial automation applications. Its compact S00 frame size enables efficient installation within motor control centers, OEM machinery, and industrial control panels.
The relay supports both manual and automatic reset modes and includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration. Screw-type terminals ensure secure wiring and simplified installation. Siemens specifies the relay for direct mounting on compatible S00 contactors within the SIRIUS motor starter system.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-1KB00-8K delivers dependable long-term performance and consistent motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1KB00-8K |
| SKU | 3RU2116-1KB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | KB008K |
| Current Setting Range | 9–12.5 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 | Up to 690 V AC |
| 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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