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    STR Series Trip Units

    This is a legacy product

    This Product is Obsolete

    These trip units provide adjustable tripping functions on electronic trip circuit breakers. The STR23SP trip unit provides basic (LS) adjustable tripping functions. The STR53UP trip unit provides advanced adjustable tripping functions on NSJ and D-frame circuit breakers. Additional functionality is achieved through ground-fault and ammeter options. They are field replaceable to allow for upgrading trip unit functionality.

    Class 9998 & 9999 Control Accessories