The Siemens 3RU2116-1CB00-8K is a compact and highly reliable thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide dependable 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 industrial motor control panels, automation systems, OEM machinery, and motor starter applications.
Built on Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and responds to overload conditions using an inverse-time delayed tripping mechanism. This helps prevent motor overheating, insulation damage, and premature equipment failure while allowing normal starting currents to pass without nuisance tripping. Integrated phase-failure sensitivity further enhances operational safety and motor reliability.
The Variant CB008K offers an adjustable overload release setting of 1.8–2.5 A, making it suitable for protecting motors used in pumps, fans, compressors, conveyors, HVAC systems, packaging equipment, and industrial automation machinery. Its compact S00 frame size allows seamless integration into motor control centers (MCCs), switchboards, and control cabinets.
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.
Manufactured to Siemens' stringent quality standards, the 3RU2116-1CB00-8K delivers long service life, dependable performance, and effective motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2116-1CB00-8K |
| SKU | 3RU2116-1CB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | CB008K |
| Current Setting Range | 1.8–2.5 A |
| Relay Size | S00 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | 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 |
| Operating Frequency | 50–60 Hz |
| Number of Main Poles | 3 |
| Rated Motor Power @ 400V AC-3 | 0.75 kW |
| Operating Temperature | -40°C to +70°C |
| Protection Features | Overload & Phase Failure Protection |
| Manufacturer | Siemens |
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