A. Air Common Breaker
B. Armature Circuit Breaker
C. Air Circuit Breaker
D. Air Control Breaker

A. Gross error
B. Shell type
C. Ratio error
D. Phase angle error

A. Current Limiting Reactor
B. Current Limiting Resonance
C. Current Limiting Reluctance
D. Current Limiting Resistor

A. Fuses
B. Relays
C. Oil switches
D. Lightning arresters