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Square D S143F - Solid-State Trip Unit 600V LSI Protection

Square D
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Square D S143F is a Micrologic solid-state trip unit designed for advanced circuit protection in industrial power distribution systems. It provides comprehensive LSI (Long-Time, Short-Time, and Instantaneous) protection functions for circuit breakers operating at a 600V AC rating. The unit is engineered for integration with a wide range of compatible breaker frames including NS, NT, NW, PG, PJ, PK, PL, RG, RJ, RK, and RL, and is constructed to meet rigorous industry standards for reliability and performance in demanding electrical environments.

Key Features & Specifications
  • Type: Solid-State Trip Unit (Micrologic Family)
  • Functions: LSI - Long-Time, Short-Time, Instantaneous Protection
  • Voltage Rating: 600V AC
  • Protection: Solid State
  • Compatible Frames: NS, NT, NW, PG, PJ, PK, PL, RG, RJ, RK, RL
  • Weight: 1 lb


Product Identification
  • Manufacturer Part Number: S143F