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    LA/LH Mission Critical Circuit Breakers

    This is a legacy product

    This Product is Obsolete

    The LA High Magnetic Withstand Circuit Breaker is designed to trip at a higher magnetic trip level. Typical Molded Case Circuit Breakers (MCCBs) and Molded Case Switches used in these applications will trip at 5–10× the handle rating.

    LA/LH Mission Critical Circuit Breakers
    • Features


      Product Cross-Reference

      Digest-product-info

      The LA High Magnetic Withstand Circuit Breaker utilizes higher magnetic trip levels and trips at 18–20× the handle rating. The LA high magnetic withstand circuit breaker allows the downstream branch circuit breaker which is upstream from the fault and nearest to the fault to clear the fault.

      The LA/LH mission critical circuit breakers deliver high-magnetic withstand capabilities in the simplicity of a basic thermal-magnetic breaker design. Fixed settings designed to deliver tested coordination levels take the guess work out of installation and maintenance. Fully-coordinated systems are possible downstream of Square D brand transformers from 15 kVA to 225 kVA when the LA or LH mission critical circuit breaker is applied with the QO(B) family of branch breakers.

      Features
      Ratings
      - UL489 listed
      - CSA certified
      - Voltage: dual-rated for 480 Y/277 V and 208 Y/120 V
      - Handle Ratings: 200 A – 400 A
      - Selective coordination rating: Reference Appendix B in Data Bulletin 0100DB0501 Short Circuit Selective Coordination for Low Voltage Circuit Breakers for a full listing

      Available configurations
      - I-Line panel construction
      - Main breaker in NQ and NF panel construction
      - Unit mount for OEM users
      Cost-effective alternative to electronic circuit breakers
      Factory preset magnetics take the guesswork out of breaker adjustments
      Easy customization with the most commonly used accessories available for factory or field installation, including shunt trips, under voltage, auxiliary switches, bell alarm and terminations

      Product Details:
      Standard Interrupting
      LAL34200MC - 200A, AC Mag. level hold 3400A trip 4000A
      LAL34225MC - 225A, AC Mag. level hold 3825A trip 4500A
      LAL34250MC - 250A, AC Mag. level hold 4250A trip 5000A
      LAL34400MC - 400A, AC Mag. level hold 6000A trip 7200A
      High Interrupting
      LHL34200MC - 200A, AC Mag. level hold 3400A trip 4000A
      LHL34225MC - 225A, AC Mag. level hold 3825A trip 4500A
      LHL34250MC - 250A, AC Mag. level hold 4250A trip 5000A
      LHL34400MC - 200A, AC Mag. level hold 6000A trip 7200A



      Benefits


      Applications

      • Emergency Power Systems
      • Commercial Buildings
      • Industrial Buildings
      • Selective Coordination
      • Healthcare Facilities
      • Data Centers