UL 489B PDF

1 Scope

1.1 These requirements cover molded-case circuit breakers, molded-case switches, and circuit-breaker enclosures rated up to 1500 V dc, intended for use with photovoltaic (PV) systems and Ref. No. 1 of Annex B.

1.2 These requirements are intended to be used in conjunction with the requirements in Ref. No. 2 of Annex B, except as modified or supplemented by this Standard.

1.3 These requirements do not cover molded-case circuit breakers or molded-case switches intended for use in battery circuits.

Summary of Topics

This reaffirmation of ANSI/UL 489B dated August 26, 2025 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS). No technical changes have been made.

As noted in the Commitment for Amendments statement located on the back side of the title page, ULSE and CSA are committed to updating this harmonized standard jointly. However, the revision pages dated August 26, 2025 will not be jointly issued by ULSE and CSA as these revision pages only address UL ANSI approval dates.