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Merlin Gerin STR28D-LI-800A - Trip Unit 800A 600V

Merlin Gerin
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Merlin Gerin STR28D-LI-800A is a solid-state trip unit from the Masterpact family, designed for long-time and instantaneous (LI) protection functions in low-voltage power distribution systems. It is rated for 600V AC and supports a continuous current of 800 amps across 3 poles. Weighing 10 lb, this STR-type unit is compatible with Masterpact M and MP frame circuit breakers and includes provisions for rating plugs and auxiliary switches. The trip unit complies with industry standards for reliable overcurrent protection in industrial and commercial electrical systems. It is typically used in switchgear, motor control centers, and main distribution panels requiring precise solid-state tripping.

Key Features & Specifications
  • Manufacturer: Merlin Gerin
  • Family: Masterpact
  • Type: STR
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600V AC
  • Amperage: 800 Amps
  • Poles: 3
  • Protection: Solid State
  • Compatible Frames: M, MP
  • Weight: 10 lb
  • Mounting Type: Draw-out
  • Includes provisions for rating plugs and auxiliary switches


Part Number: STR28D-LI-800A