UL 489 Listed Circuit Breakers

The best choice for overcurrent protection in North American countries. These breakers comply with the American UL standard and the Canadian CSA standard, and are listed by UL. They are suitable for use with feeders and for branch circuit protection.

UL 489 Listed Molded Case Circuit Breakers NF-U

This kind of breaker complies to UL 489 and CSA C22.1No.5.
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Mercor – Protecting Warsaw Metro from fire emergencies