Overview
The Telemecanique LB1-LC03M53 is an integral motor protection overload relay designed for 32-ampere combination motor control systems. This thermal overload protection module integrates seamlessly with Telemecanique’s LD-series integral starters (LD1LC, LD4LC, LD5LC) and provides fixed magnetic protection paired with adjustable thermal overload sensing. Manufactured under Schneider Electric’s Telemecanique brand, the LB1-LC03M53 meets IEC standards and is rated for 575VAC industrial applications.
Key Features
- Thermal overload protection module rated for 23–32A operational current
- Fixed magnetic protection set at 15× maximum thermal current
- Adjustable overload range 0.25–0.40A (standard M03 configuration)
- IEC 947-6-2 compliant; UL, CSA, BS, VDE, DEMKO approved
- 42 kA rated breaking capacity at 480 VAC
- Compact modular design compatible with integral starter frameworks
Technical Specifications
| Parameter | Value |
| Part Number | LB1-LC03M53 |
| Manufacturer | Telemecanique (Schneider Electric) |
| Product Type | Thermal Overload Protection Module |
| Rated Current | 32A AC-3 Duty |
| Voltage Rating | 575 VAC Maximum |
| Breaking Capacity | 42 kA at 480 VAC |
| Overload Range | 0.25–0.40A (M03) |
| Protection Type | Fixed Magnetic (15×) + Thermal Adjustable |
| Standards Compliance | IEC 947-6-2, UL, CSA, BS, DEMKO, VDE |
| Weight | 1.0 lbs |
| Compatible Controllers | LD1LC, LD4LC, LD5LC 32A Integral Starters |
Typical Applications
The LB1-LC03M53 is commonly deployed in:
- Integral motor control panels rated for 32A, AC-3 duty cycles
- Machinery requiring fixed and adjustable dual-stage protection
- Pump, fan, and compressor motor starter circuits
- Industrial automation systems utilizing Telemecanique/Schneider integral starters
- OEM equipment retrofits and maintenance replacements
Compatibility & Replacements
Compatible With
- Telemecanique LD1LC, LD4LC, LD5LC 32A integral starter chassis
- Schneider Electric integral self-protected motor control systems
- IEC 947-6-2 compliant motor protection frameworks
- Industrial AC-3 duty motor circuits up to 32A
Replaces / Drop-In Replacement For
- Original Telemecanique LB1-LC03M53 (discontinued by manufacturer; this is direct equivalent)
- Functionally equivalent to other LB1LC M03 series protection modules in 32A integral starter applications
- Verify exact controller compatibility with your system integrator before ordering
Works With
- LD1LC030, LD4LC030, LD5LC130 integral starter controllers
- Telemecanique auxiliary contact modules (LA1 series)
- IEC-compliant three-phase motor circuits
- Manual and semi-automatic motor control systems
