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Square D S143A - Solid-State Trip Unit 5A 600VAC (LSI Protection)

Square D
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Square D S143A is a solid-state trip unit designed for advanced circuit protection within compatible molded case circuit breaker frames. It provides precise 5A current protection with a 600V AC voltage rating, utilizing LSI (Long Time, Short Time, Instantaneous) functions for comprehensive overload and fault coordination. The unit is constructed with a compact footprint of 78.49 mm in depth by 112.78 mm in width and a weight of 1.06 lb, ensuring robust integration. It complies with UL and CSA certifications and meets RoHS standards for material use. This trip unit is engineered for industrial power distribution systems requiring reliable, solid-state protection logic.

Key Features & Specifications
  • Type: Solid-state electronic trip unit for molded case circuit breakers
  • Voltage Rating: 600V AC
  • Current Rating: 5A
  • Dimensions: 3.09 in (78.49 mm) Depth x 4.44 in (112.78 mm) Width
  • Standards: RoHS compliant
  • Protection: Solid State with LSI (Long Time, Short Time, Instantaneous) functions
  • Certification: UL, CSA
  • Compatible Frames: NS, NT, NW, PG, PJ, PK, PL, RG, RJ, RK, RL
  • Family: Micrologic
  • Country of Origin: United States
  • Weight: 1.06 lb


Product Identification
  • UPC: 785901560715
  • GTIN: 00785901560715