Overview
The Siemens 3RU1116-1KB0 is a Class 10 thermal overload relay engineered for direct mounting on Siemens 3RT1 size S00 contactors. This relay provides current-dependent motor protection against overload and phase failure conditions in AC and DC motor circuits. The compact design integrates seamlessly with 3RT1015, 3RT1016, and 3RT1017 contactors to save panel space and simplify installation.
Key Features
- Adjustable trip range: 9–12A with manual and automatic reset options
- Class 10 trip classification for normal start-up conditions
- Phase loss and phase asymmetry protection
- Direct contactor mounting (size S00) eliminates separate base frame
- Screw terminals for secure main and auxiliary circuit connections
- Temperature-compensated operation (−20°C to +60°C)
- Dual auxiliary contacts: 1NO + 1NC for flexible control logic
Technical Specifications
- Trip Class: 10 (normal start-up)
- Adjustment Range: 9–12A Full Load Current
- Contact Rating: 12A
- Power Rating: 5.5 kW (3-phase)
- Contactor Size: S00 (IEC)
- Terminal Type: Screw
- Auxiliary Contacts: 1 normally open, 1 normally closed
- Reset: Manual/automatic selectable
- Temperature Range: −20°C to +60°C
- Dimensions: 68 × 45 × 87 mm (L × W × H)
- Weight: 0.31 lbs
- Compliance: IEC 947, VDE 0990, EN 60947
- RoHS Compliant: Yes
Typical Applications
The 3RU1116-1KB0 is suitable for three-phase and single-phase AC/DC motor protection in:
- Machine tool control and automation systems
- HVAC and refrigeration compressor circuits
- Pump and fan motor starters
- General industrial motor circuits requiring Class 10 protection
- Legacy Siemens SIRIUS and S7-1200/1500 PLC-controlled systems
Compatibility & Replacements
This relay is designed for use with Siemens 3RT1 size S00 contactors (part numbers 3RT1015, 3RT1016, 3RT1017). The 3RU1116-1KB0 is discontinued by the manufacturer; Siemens recommends upgrading to the 3RU2 SIRIUS series for new installations. However, this unit remains a reliable used/refurbished option for maintenance and retrofit applications where original equipment compatibility is required. Verify mounting compatibility with your specific contactor model before ordering.
