The Siemens 3RU2116-1CB0 is a compact and reliable thermal overload relay from the SIRIUS 3RU2 Series, designed to provide effective protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Featuring an adjustable current setting range of 1.8–2.5 A, Class 10 tripping characteristics, and compatibility with Size S00 Siemens contactors, this relay is ideal for motor starter combinations, industrial automation systems, HVAC equipment, pumps, fans, and OEM machinery.
Built on Siemens' proven inverse-time thermal protection technology, the relay continuously monitors motor current and disconnects the motor when overload conditions exceed permissible limits. Its thermal tripping mechanism helps prevent motor overheating, winding damage, insulation deterioration, and costly downtime while allowing normal motor starting currents to pass without nuisance tripping. Integrated phase-failure protection further enhances motor reliability and operational safety.
The Variant CB0 provides an adjustable overload release setting of 1.8–2.5 A, making it suitable for protecting small three-phase motors used in conveyors, compressors, pumps, ventilation systems, packaging equipment, and industrial process machinery. Its compact S00 frame size enables efficient installation in motor control centers (MCCs), control panels, switchboards, and machine-building applications.
Designed for direct mounting on compatible Siemens contactors, the relay incorporates 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, trip indication, and control circuit integration. It supports both manual and automatic reset modes and utilizes screw-type terminals for secure electrical connections and simplified installation. Additional features include switch position indication, test functionality, and dependable Class 10 motor protection performance.
Manufactured according to Siemens' stringent quality standards, the 3RU2116-1CB0 delivers dependable long-term performance and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1CB0 |
| SKU | 3RU2116-1CB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | CB0 |
| Current Setting Range | 1.8–2.5 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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