1VAL050503-MB Rev B Replaces (1VAL057485-MB Rev. C) Oct 2013
22
M
AINTENANCE
ADVAC™ circuit breakers are designed for a minimum amount of maintenance. Circuit breakers in a clean, non-
corrosive environment require only annual inspection. Dusty or corrosive environments require inspection more often at
the discretion of the user. Inspection is required following each interrupted fault.
DO NOT
work on an energized breaker.
DO NOT
work on a breaker unless all components are disconnected by means of a visible break and securely grounded.
DO NOT
work on a breaker with power supplied to the secondary control circuit.
DO NOT
defeat safety interlocks. This may result in bodily injury, death and/or equipment damage.
DO NOT
work on a closed breaker.
DO NOT
work on a breaker with a charged closing spring.
DO NOT
use a circuit breaker by itself as the sole means of isolating a high voltage circuit.
DO NOT
leave a breaker in an intermediate position in a cell. Always have the breaker in the disconnect, test or
connected position.
M
ECHANISM
:
(Refer to Fig. 4a & 4b)
The mechanism requires visual inspection of hardware, lubrication and operation during routine inspection.
Before beginning any maintenance, open breaker external control power fuses (or breakers), discharge the Closing
Springs by pressing the Manual Close Button. Open the breaker by pushing the Manual Open Button. Press the Close
and Open buttons again to ensure the breaker is fully discharged. Verify springs are discharged by inspection of the
Spring Charge Indicator. Remove the front cover with a Phillips screwdriver. Correct any loose or missing hardware.
Always lubricate the working surface of the Cams (B) and the entire Motor Linkage Assembly (P). Verify lubrication on
latching surfaces located above the Charging Motor (D) in the mechanism (See Fig 4b). Remove any grease on the
breaker frame Verify that the operation of the Manual Close and Open Push Buttons is free and smooth. Replace the
front cover before operation. Manually operate the mechanism a minimum of 2-5 operations to exercise the mechanism.
MAINTENANCE
DANGER
High Speed Mechanical Parts. Serious injury may occur.
Keep hands and tools clear of the mechanism during opening and closing
operations and anytime the closing or opening springs are charged. Before
maintenance verify Closing Spring indicator reads “Discharged”. Opening
springs are always charged when the circuit breaker is closed.