Overview
The Telemecanique LR1-D09 is a three-pole thermal overload relay designed for motor protection in industrial control systems. This Class 10 bimetallic device provides reliable AC motor overcurrent and overload protection in circuits rated up to 600V AC, 50/60Hz. The LR1-D09 is widely used in motor starter circuits with contactors to prevent motor damage from sustained overloads and phase loss conditions.
Key Features
- Class 10 Protection: Fast-acting thermal bimetallic element ensures predictable trip times to protect motors from extended overloads
- Wide Adjustment Range: Multiple current rating options (LR1-D09 variants cover 2.5A–10A+ ranges) allow flexible motor protection across different installation requirements
- Phase Loss Detection: Thermal design automatically detects phase break conditions, preventing single-phase motor operation damage
- 600V AC Rated: Suitable for standard industrial distribution voltages and IEC 292 / VDE 0660 compliant
- Compact Modular Design: Three-pole configuration mounts directly onto contactors or DIN rails in confined panel spaces
Technical Specifications
- Rated Insulation Voltage: 660V AC
- Operating Voltage Range: 600V AC maximum
- Frequency: 50/60Hz
- Protection Class: Class 10 (per IEC 947-1 standard)
- Withstand Current (Short Circuit): 5,000A RMS symmetrical
- Auxiliary Contacts: Ac H.D./DC: 60W maximum
- Weight: 130 grams
- Mounting: Three-pole contactor mount or screw clamp terminals
- Temperature Rating: Standard industrial operating range (-5°C to +50°C ambient)
- Standards Compliance: IEC 292-1, VDE 0660, IEC 947-1
Typical Applications
The Telemecanique LR1-D09 thermal overload relay is ideal for:
- AC motor protection in machine tool control circuits
- HVAC and refrigeration unit motor starters
- Conveyor and pump motor overcurrent protection
- Industrial automation systems requiring Class 10 thermal protection
- Three-phase motor control panels with contactor-based starters
- Legacy industrial equipment retrofit and upgrade installations
Compatibility & Replacements
Compatible With
- Telemecanique/Schneider Electric contactors (F115–F630 series)
- Standard DIN-rail mounted AC motor starters
- IEC 292 three-phase AC distribution systems
- 660V industrial control circuits
- 50/60Hz AC supply networks
Replaces / Drop-In Replacement For
- Telemecanique LR1-D09 variants with different current ratings (LR1-D09-301, LR1-D09-304, LR1-D09-308, LR1-D09-312, LR1-D09-314)
- Other Class 10 three-pole thermal overload relays with equivalent 600V/660V ratings
Works With
- Telemecanique / Schneider Electric StarterPack control software
- IEC 60947-4-1 compliant motor starters and soft starters
- Direct-on-line (DOL) starter circuits
- Reduced voltage soft-starter configurations
- Contactor-based AC motor control schemes
