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Square D 54731 - Masterpact Rating Plug 125A

Square D
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Square D 54731 is a Masterpact rating plug designed to configure the trip unit current rating for compatible circuit breakers. It sets a fixed 125A current rating for use with STR28, STR38, and STR58 series trip units in MP frame breakers. The compact, solid-state plug has a weight of 1 lb and integrates directly into the breaker's trip unit housing. It is engineered for industrial power distribution systems requiring precise and reliable overcurrent protection coordination.

Key Features & Specifications
  • Type: Electronic rating plug for Masterpact MP frame circuit breakers
  • Current Rating: 125A
  • Compatible Frames: MP
  • Trip Type: STR28D, STR28DP, STR38S, STR38SP, STR38ST, STR38SW, STR58U, STR58UP, STR58UT, STR58UW
  • Amperage Range: 125A (Fixed)
  • Weight: 1 lb
  • Item Subcategory: Rating Plug
  • Family: Masterpact