Historical

UL 489I Ed. 1-2019

Outline of Investigation for Solid State Molded-Case Circuit Breakers - Published Date: April 10, 2020

These requirements cover solid state molded-case circuit breakers rated up to 1000 Vac and 1500 Vdc that switch using semiconductors and have integral air gap for isolation. These solid state moldedcase circuit breakers are intended to provide service entrance, feeder, and branch circuit protection in accordance with the National Electrical Code, ANSI/NFPA-70. These solid state molded-case breakers may require auxiliary control power. These requirements are intended to be used in conjunction with the requirements in the Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures, UL 489, hereafter referred to as UL 489, except as modified or supplemented by this Outline.

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Underwriters Laboratories [ul]

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