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Merlin Gerin STR28D-LI-1200A - Solid-State Trip Unit 1200A 600V 3-Pole

Merlin Gerin
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Merlin Gerin STR28D-LI-1200A is a solid-state trip unit designed for overcurrent protection within Masterpact power circuit breakers. It provides Long-Time and Instantaneous (LI) protection functions and is rated for 600V AC systems with a continuous current rating of 1200 amperes. This 3-pole unit weighs 10 lb and is compatible with Masterpact M and MP frame circuit breakers. The unit is engineered for panel or switchgear mounting, typical for Masterpact installations, and is suitable for demanding industrial power distribution environments requiring precise solid-state protection.

Key Features & Specifications
  • Manufacturer: Merlin Gerin
  • Item Subcategory: Trip Units & Programmers
  • Family: Masterpact
  • Type: STR
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600 V
  • Poles: 3
  • Amperage: 1200 A
  • Protection: Solid State
  • Compatible Frames: M, MP
  • Weight: 10 lb
  • Mounting Type: Panel or switchgear mount
  • Trip Unit: Masterpact LI solid-state


Part Number: STR28D-LI-1200A