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Do Multi-9 breakers have a 480 Vac Delta rating?

FA87576

23 January 2021

Issue:
Multi 9 (M9) breaker and 480 Vac breakers

Product Line:
Circuit Breakers

Environment:
Applies to Multi 9 (M9) circuit breakers

Cause:
Need a 480V breaker in the miniature style.

Resolution:
No, the Multi 9 breakers are not rated 480 Vac delta.

The UL 1077 listed M9 is rated for 480Y/277 Vac, not 480 Vac delta.
The IEC version has a 440 Vac rating.
The UL 489 version has a 480Y/277 Vac rating (.5A-20 A), 240 Vac (.5 -35 A).