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Square D S173B - Solid-State Trip Unit 600V LSI Protection

Square D
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Square D S173B 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 with a 600V AC voltage rating. This 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 features a robust construction with a weight of 1 lb. It complies with relevant industry standards for electrical safety and performance, making it suitable for critical applications in manufacturing plants, data centers, and commercial facilities where reliable selective coordination and equipment protection are required.

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


Product Identification
  • Manufacturer Part Number: S173B