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5. Circuit Breaker Installation/Removal
Inspection and Preparation
Before installing, operating, or removing a circuit breaker, refer
to Publication#DEH-50001 SecoVac Vacuum Circuit Breaker
Installation Manual for preparation, inspection, and testing.
Check thoroughly for damaged or loose parts and for any dirt
or foreign matter.
Be sure that a thin film of GE lubricating grease (D6A15A2)
is present on primary disconnects of the switchgear before
installing the circuit breaker.
Ensure there are no unnecessary materials or tools inside of
the circuit breaker compartment and proceed to clean the
compartment body and the insulation parts with a soft cloth.
Racking
The racking operation features two positions, CONNECTED and
DISCONNECTED/TEST.
• CONNECTED – In the CONNECTED position, the primary
and secondary contacts are fully engaged. The circuit
breaker must be open before it can be racked out of
this position.
• DISCONNECTED/TEST – When in the DISCONNECT/TEST
position, the primary contacts are disconnected, but the
secondary contacts remain engaged. This allows complete
circuit breaker operation without energizing the
primary circuit.
Circuit breakers may be racked between these two positions
with the compartment door closed and latched.
All circuit breakers are supported on the drawout rails mounted
on the side walls of the SecoGear circuit breaker compartment.
On SecoVac vacuum circuit breakers, two wheels on each side of
the circuit breaker rest on each drawout rail.
Figure 5-1: Two-High Breaker Section
Circuit breaker movement is provided by a racking mechanism
mounted in the bottom of the cassette. This mechanism utilizes
a center-mounted drive screw. When the screw is rotated
clockwise by the racking handle, the circuit breaker assembly
mounted on top of the cassette is pulled into the
connected position.
The racking handle is inserted through an opening in the front of
the compartment door as shown in Figure 3-2.
SecoGear – Installation, Operation and Maintenance Manual 36 of 56
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