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Merlin Gerin ST308S-LSI-400A - Trip Unit 400A 600V 3-Pole Solid State

Merlin Gerin
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The Merlin Gerin ST308S-LSI-400A is a solid-state trip unit designed for use with Masterpact M and MP circuit breaker frames, providing comprehensive long-time, short-time, and instantaneous (LSI) protection functions. This three-pole unit is rated for 600V AC and has a current rating of 400A, with a minimum and maximum amperage of 400A. Weighing 15 lb, it integrates solid-state protection technology for precise and reliable overcurrent protection in industrial power distribution systems. The ST308S-LSI-400A complies with industry standards for circuit breaker trip units, ensuring robust performance in demanding environments. It is typically applied in industrial switchgear, motor control centers, and main service entrance equipment requiring adjustable LSI protection curves.

Key Features & Specifications
  • Type: Solid-state trip unit for Masterpact frames
  • Voltage Rating: 600V AC
  • Current Rating: 400A (minimum and maximum)
  • Poles: 3
  • Protection: Solid State
  • Functions: LSI - Long-Time, Short-Time and Instantaneous
  • Compatible Frames: M, MP
  • Weight: 15 lb
  • Family: Masterpact
  • Item Subcategory: Trip Units & Programmers


Product Identification
  • Manufacturer: Merlin Gerin
  • Model: ST308S-LSI-400A