The Siemens 3RU2116-0KB00-8K is a compact and dependable thermal overload relay from the trusted 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 0.9–1.25 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for small motor protection applications in industrial automation, machinery, HVAC systems, pumps, and control panels.
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 SIRIUS 3RU2 series supports manual and automatic reset operation for flexible motor protection schemes.
The Variant KB008K provides an adjustable overload release setting of 0.9–1.25 A, making it suitable for protecting fractional horsepower and small three-phase motors used in conveyors, dosing systems, compact pumps, fans, machine tools, and OEM equipment. Its compact S00 frame size enables efficient installation in motor control centers (MCCs), switchboards, and industrial control cabinets.
Designed for direct mounting on compatible Siemens contactors, the relay incorporates 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 features screw-type terminals for secure electrical connections and simplified installation. The relay is rated for applications up to 690 V AC and operates reliably in demanding industrial environments.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-0KB00-8K delivers dependable long-term performance and effective motor protection where accurate low-current overload monitoring is required.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-0KB00-8K |
| SKU | 3RU2116-0KB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | KB008K |
| Current Setting Range | 0.9–1.25 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 |
| Rated Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Operating Temperature | -40°C to +70°C |
| Protection Features | Overload & Phase Failure Protection |
| Manufacturer | Siemens |
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