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What is the difference between catalog numbers for PowerBus 225 bus plugs: PBPQOR5A100, PBPQOR5A100M420B. What does suffix M420B mean?

The suffix M420B means the busplug has (3) 20 ampere QOB breakers and (3) 20 ampere twistlock receptacles.

CTA-ID : 2031933
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