Compaq AlphaServer GS60 Operation Manual page 75

The circuit breaker and power indicators are at the rear of the cabinet.
Circuit Breaker
The circuit breaker controls power to the entire system, including the power regulators,
blower, battery backup, and in-cabinet options. Current overload causes the breaker to
trip to the off position, so that power to the system is turned off.
For normal operation, the circuit breaker must be in the on position, in which the
handle is pushed up. To shut the circuit breaker off, push the handle down.
AC Power Indicators
With three-phase power, the power indicators are located below the circuit breaker
handle. When the system is powered on, the power indicators are red. When the circuit
breaker is off, tripped, or open, the power indicators change to green. When one phase
has tripped, the power indicator for that phase will change to green.
NOTE: The power indicators in the 202V version are different. If one phase trips, all
power indicators trip, so that all indicators are green.
Circuit Breaker Lockout
With three-phase power, the circuit breaker lockout secures the circuit breaker in the
off position. The lockout consists of a hinged plate that is placed over the circuit
breaker handle. A padlock can be placed on the right or left side of the lockout, so that
no one can turn the power on.
Single–Phase Power
On older systems with single-phase power, there are no power indicators with single-
phase power, nor is there circuit breaker lockout.
AlphaServer 8400 System 3-27