Circuit Breaker Control

Question 1

What is the purpose of a circuit breaker?

Answer 1

To control power flow,
minimize damage to plant equipment,
maintain system continuity to maximum degree practical upon loss of power supply.

Question 2

What are the indicating light colors for a tripped and closed breaker?

Answer 2

Field: Green is open, Red is closed.
MCR: Depends on normal configuration. Green is normal.