Description
The Schneider Electric (Square D) LRD12 is a thermal overload relay designed to provide reliable motor protection across a wide range of HVAC and industrial applications. Engineered for seamless integration with TeSys D-series contactors, this overload relay delivers accurate, dependable overcurrent protection to safeguard motors from damage caused by sustained overloads, phase loss, and phase imbalance.
Product Overview
The LRD12 features a current adjustment range of 5.5 to 8 amps, making it well-suited for protecting single-phase and three-phase motors commonly found in HVAC equipment including compressors, blower motors, and fan motors. Its bimetallic thermal trip mechanism provides class 10 trip characteristics, ensuring fast response to overload conditions while minimizing nuisance tripping during normal motor start-up.
Key Features
- Current adjustment range: 5.5 to 8A
- Compatible with Schneider Electric TeSys D-series contactors (LC1-D09 through LC1-D38)
- Class 10 trip characteristics for reliable motor protection
- Bimetallic thermal trip mechanism
- Manual and automatic reset modes
- Built-in phase loss sensitivity for three-phase motor protection
- Integral test and stop functions
- 1 N/O + 1 N/C auxiliary contact output for control circuit integration
- Ambient temperature compensation for consistent performance across varying environments
- Compact, DIN-rail compatible design
Applications
- HVAC compressor motor protection
- Blower and fan motor protection
- Pump motor protection in hydronic systems
- Industrial motor control panels
- Commercial refrigeration equipment
Why Choose the LRD12?
Schneider Electric’s TeSys LRD series overload relays are globally recognized for their precision, durability, and ease of installation. The LRD12 snaps directly onto compatible TeSys D contactors without additional wiring, reducing installation time and panel space. The adjustable current dial allows technicians to fine-tune protection to the specific motor’s full-load amperage, maximizing both protection and uptime. With built-in phase loss sensitivity, the LRD12 helps prevent costly motor burnout in three-phase applications — a critical feature in demanding HVAC environments.
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