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Automatic Shutters
Standard automatic shutters (Figure 3-6) are constructed from
glass-reinforced polyester and help provide protection against
contact with the energized stationary primary disconnects
when the circuit breaker is removed from its compartment.
The shutters can be manually operated for maintenance and
padlocked in the closed position for safety.
Figure 3-6: Automatic Shutters
DANGER
!
Hazard of electric shock or burn. Turn off power
to this equipment before working inside.
Figure 3-7: Interlock for Secondary Disconnect Plug Removal
The shutters are closed when the circuit breaker is in the
DISCONNECTED/TEST position. As the circuit breaker is racked
from the DISCONNECTED/TEST position to the CONNECTED
position, the shutters open allowing the circuit breaker to
connect to the primary disconnects.
Interlocks
The circuit breaker compartment is equipped with the following
IEEE C37.20.2 required interlocks to block incorrect operations
that could put the operator at risk and compromise the
efficiency and reliability of equipment:
• Interlocks to prevent closing the primary contacts while the
circuit breaker is being racked to or from the CONNECTED
position, by blocking the operating mechanism mechanically
and electrically
• Mechanical Interlocks preventing racking of a closed
circuit breaker
• Mechanical Interlock to discharge mechanism spring
energy prior to withdrawal of the circuit breaker from
the compartment
• Rejection interlocks to prevent insertion of improperly
rated circuit breaker
• The secondary disconnect plug (Figure 3-7) must be
connected prior to racking the circuit breaker to the
CONNECTED position and cannot be removed while the
circuit breaker remains in the CONNECTED position.
• The Open - Close- Open automatically opens the circuit
breaker when leaving or entering the compartment, and that
springs are discharged, Figure 3-8.
Other safety interlocking features include compartment door
and racking screw access padlocking (Figure 3-9). For more
information, see SECTION 9: Maintenance, "SecoGear Padlocks
and Keylocks."
SecoGear – Installation, Operation and Maintenance Manual 18 of 56
Interlock Lever
Interlock Roller
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