Description
The Schneider Electric (Square D) LRD3353 is a TeSys D series thermal overload relay engineered to deliver dependable motor protection across a wide range of commercial and industrial HVAC applications. Designed to mount directly onto TeSys D-series contactors, this overload relay provides precise, automatic protection against overcurrent conditions that can damage motors and connected equipment.
Product Overview
The LRD3353 features a current adjustment range of 23 to 32 amps, making it well-suited for protecting three-phase motors used in compressors, fan motors, pumps, and other HVAC-critical loads. Its bimetallic trip mechanism responds to sustained overloads and phase-loss conditions, helping to prevent costly motor burnout and unplanned downtime.
Key Features
- Current setting range: 23–32A
- Direct mounting onto Schneider Electric TeSys D-series contactors
- Bimetallic thermal trip mechanism for reliable overload detection
- Phase-loss sensitivity to protect against single-phasing conditions
- Manual and automatic reset modes
- Integral test and reset buttons for easy field verification
- Auxiliary contact output for remote fault signaling
- Compact, DIN-rail compatible design
Applications
- HVAC compressor motor protection
- Condenser and evaporator fan motor circuits
- Hydronic circulator and chilled water pump starters
- Commercial refrigeration motor control panels
- General-purpose three-phase motor starter assemblies
Why Choose the LRD3353
As part of Schneider Electric’s globally recognized TeSys D platform, the LRD3353 integrates seamlessly into existing motor control infrastructure. Its robust construction and proven trip accuracy help reduce nuisance trips while ensuring motors are protected when genuine fault conditions arise — a critical advantage in demanding HVAC environments where uptime matters.
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