This Part applies to Class R fuses rated 600 A or less and either 250 or 600 V ac. DC ratings are optional.
The following changes in requirements to the Standard for Low-Voltage Fuses - Part 12: Class R Fuses, UL 248-12, are being proposed for preliminary review and comment only:
1. For Preliminary Review Only: Proposed Third Edition of the Standard for Low-Voltage Fuses - Part 12: Class R Fuses, UL 248-12.
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