What is the Meaning of O.C.B.?

Electrical Question from Myint about What is O.C.B.
Background: Myint, a Student from Yagon,  Myanmar
Question: What is the meaning  of O.C.B?

Dave’s Reply:
Thanks for your electrical question Myint.
Depending on your application, here are some definitions for O.C.B.
Outside Branch Circuit
Over Current Breaker
Oil Circuit Breaker

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