Overview
The Schneider Electric LRD12 is a TeSys Deca thermal overload relay designed for motor protection in industrial automation. This Class 10A relay provides adjustable thermal protection with a current range of 5.5 to 8 amperes and operates reliably across AC circuits from 0–400 Hz. Engineered for direct contactor mounting on TeSys D-line starters, the LRD12 detects overcurrent conditions and works in conjunction with LC1D series contactors to instantly disconnect power and prevent motor damage.
Key Features
- Adjustable thermal protection: 5.5–8 A rated current with Class 10A tripping calibration
- Differential thermal design detects phase imbalance and line overcurrents
- Integrated manual/automatic reset button for flexible operation control
- Multiple mounting options: direct under-contactor, DIN rail, or plate mounting
- Three connection options: screw clamp terminals, spring terminals, or EverLink connectors
- Sealable flap and trip indicator for safety and diagnostics
- Multi-standard certifications: IEC, UL, CSA, ATEX, CCC, EAC, Marine, RoHS/REACH compliant
Technical Specifications
- Thermal Protection Range: 5.5–8 A (Class 10A)
- Rated Insulation Voltage: 600 V (UL/CSA), 690 V (IEC 60947-4-1)
- Network Type: AC/DC
- Network Frequency: 0–400 Hz
- Contact Configuration: 1NO–1NC (1 Form A / 1 Form B)
- Contact Rating: 10 A at rated voltage
- Poles: 3
- Tripping Threshold: 1.14 ± 0.06 Ir (IEC 60947-4-1)
- Operating Temperature: −20 to +60 °C
- Enclosure Rating: IP20
- Dimensions: 45 mm W × 70 mm D × 51 mm H
- Weight: Compact lightweight construction
- Terminal Type: Screw clamp, spring, or EverLink
Typical Applications
- Three-phase AC motor protection in pump, fan, and compressor applications
- Industrial machinery and process control motor starters
- HVAC and refrigeration motor circuits
- General industrial overload protection up to 150 A motor ratings (when paired with appropriate TeSys D contactors)
- OEM machine builders and panel integrators
Compatibility & Replacements
Compatible With
- TeSys D-line contactors: LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38
- 9 to 38 ampere TeSys D contactor range
- 45 mm wide mounting footprint (up to 38 A rating)
- AC motor starter assemblies and soft-start panels
- Modular pre-wiring kits and terminal block systems
Replaces / Drop-In Replacement For
- Previous Telemecanique LR3D12 series overload relays
- Square D Schneider Electric OEM relay equivalents with matching 5.5–8 A range
Works With
- TeSys Deca motor control centers (MCCs)
- IEC 60947-4-1 compliant motor protection schemes
- Industrial relay logic and PLC-based motor protection circuits
- Remote electrical reset modules (optional accessories)
