Overview
The Telemecanique LB1-LC03M is a protection module designed for INTEGRAL self-protected combination motor controllers. Manufactured by Schneider Electric/Telemecanique in France, this solid-state overload relay provides both thermal and magnetic trip protection, making it a reliable component for motor control circuits in industrial automation applications. The LB1-LC03M series includes multiple current ratings identified by suffix (M03, M04, M05, M06, etc.), each tailored for specific amperage ranges.
Key Features
- Adjustable magnetic protection with 6 to 12 times maximum thermal current range
- Ambient-compensated thermal overload protection (Class 10)
- Maximum voltage rating: 690V AC
- 3-pole configuration for three-phase motor circuits
- IEC 947-6-2 compliant
- Approved to ASTA, BS, CSA, DEMKO, IEC, NEMKO, SEMKO, UL, and VDE standards
- 42 kA rated breaking capacity at 480 VAC
- Compact DIN rail mounting design
Technical Specifications
- Maximum Input Voltage: 690V AC
- Number of Poles: 3
- Thermal Protection: Ambient-compensated Class 10
- Magnetic Protection: Adjustable (6–12× thermal current)
- Rated Breaking Capacity: 42 kA @ 480 VAC
- Certification Standards: ASTA, BS, CSA, DEMKO, IEC, NEMKO, SEMKO, UL, VDE
- Manufacturer: Telemecanique (Schneider Electric)
- Origin: France
- Weight: Approximately 450–480 g
- Mounting Type: 35 mm DIN rail
Typical Applications
The Telemecanique LB1-LC03M is used in industrial motor control circuits, including:
- INTEGRAL 32 and INTEGRAL 63 combination motor starters
- Three-phase AC motor protection in manufacturing and machinery
- Pump and fan motor control systems
- Compressor and blower protection circuits
- Industrial automation control panels
- Retrofit and replacement in existing motion control installations
Compatibility & Replacements
Compatible With
- INTEGRAL self-protected combination motor controllers (18A, 32A, 63A ratings)
- LD-LC series contactors (LD1LC030, LD4LC030, LD5LC130)
- LB-LC series starters and motor protection assemblies
- Three-phase AC motor control circuits rated up to 690V AC
- Industrial panels using Telemecanique INTEGRAL starter systems
Replaces / Drop-In Replacement For
- LB1-LC03M03 (0.25–0.40 A thermal, 2.4–4.8 A magnetic)
- LB1-LC03M04 (0.40–0.63 A thermal, 3.8–7.6 A magnetic)
- LB1-LC03M05 (0.63–1.0 A thermal, 6.0–12 A magnetic)
- LB1-LC03M06 (1.0–1.6 A thermal, 9.5–19 A magnetic)
- LB1-LC03M07, M08, M10, M13, M17, M21, M22, and M53 variants
- LB6-LC03M series (six-pole industrial variant)
Works With
- IEC 947-6-2 motor starter standards and systems
- Telemecanique and Schneider Electric motor control ecosystems
- Standard three-phase AC power distribution (50/60 Hz)
- Manual and remote control circuits
- Industrial automation platforms using external relays and protective modules
