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Do Multi 9 breakers have a 480 Vac delta rating?

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

Product Line:
Circuit Breakers

Resolution:
No, the Multi 9 breakers are not rated for 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 (0.5 - 20 A), 240 Vac (0.5 - 35 A).