Product Overview
The Siemens SIRIUS 3RU2116-1KB0 is a three-pole thermal overload relay for protecting three-phase motors against overload and phase failure.
It mounts directly beneath compatible Siemens 3RT2015–3RT2018 S00 contactors and disconnects the contactor-control circuit when the motor current exceeds the selected setting.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Siemens |
| Product family | SIRIUS 3RU21 |
| Full part number | 3RU2116-1KB0 |
| Device type | Thermal motor-overload relay |
| Current-adjustment range | 9–12.5 A |
| Trip class | Class 10 |
| Number of protected phases | Three |
| Size | S00 |
| Mounting | Direct contactor mounting |
| Main terminals | Screw terminals |
| Auxiliary terminals | Screw terminals |
| Auxiliary contacts | 1 NO + 1 NC |
| Reset operation | Manual or automatic |
| Phase-failure sensitivity | Yes |
| Stop/test function | Integrated |
| Trip indication | Mechanical position indicator |
| Maximum motor rating | Approximately 5.5 kW at 400 V |
| Front protection | IP20 |
| Operating temperature | Approximately −40°C to +70°C |
| Mounting position | Any position |
| Expected safety-related service life | Up to 20 years under specified conditions |
Compatible Siemens Contactors
This S00 overload relay is designed for direct mounting on compatible Siemens contactors including:
- 3RT2015
- 3RT2016
- 3RT2017
- 3RT2018
Compatibility must still be confirmed using the complete contactor part number and motor current.
Main Features
- Adjustable 9–12.5 A motor-protection range
- Class 10 thermal trip characteristic
- Protection against overload and phase failure
- Direct mounting beneath S00 contactors
- Manual or automatic reset selection
- Integrated stop and test controls
- One normally open and one normally closed auxiliary contact
- Visible trip-position indication
- Temperature-compensated bimetal operation
- Compact screw-terminal construction
Marine and Offshore Applications
- Cooling-water pumps
- Fuel-oil transfer pumps
- Lubricating-oil pumps
- Bilge and ballast pumps
- Engine-room ventilation fans
- Refrigeration compressors
- Hydraulic-power units
- Air compressors
- Boiler feed pumps
- Deck-machinery motors
- Auxiliary motor-control centres
