Welcome to our website.
To view product availability in a specific country, select from the country list below. For Investor Relations, please visit our global site.
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.