GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 7)

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4.2.2 Closing spring interlock
This racking-track operated interlock (item 4, Figure 20)
prevents racking into or out of the metalclad compartment a
breaker that has the closing spring charged. This action is
accomplished by a roller on the right side of the breaker.
Mechanism, which contacts the racking mechanism and
discharges the closing spring, unless the breaker is in the
“DISCONNECT/TEST” position or the “CONNECT” position in
the metalclad compartment. This interlock also opens the
CL/MS switch in the motor circuit to prevent electrical
charging of the closing spring when the breaker is between
the “DISCONNECT/TEST” and “CONNECT” position in the
metalclad compartment.
4.2.3 Negative Interlock
The function of this racking-track operated interlock (item5,
Figure 19) is to remove the trip latch from the trip roller
thereby preventing a closing operation. The interlock also
opens the LCS switch in the closing circuit thereby removing
the close circuit power. The negative trip interlock is
functional while the beaker is being moved between the
“DISCONNECT/TEST” and “CONNECT” position and upon
withdrawal from the metalclad compartment.
4.2.4 Positive Interlock Bar
This interlock will prevent the racking of a closed breaker into
or out of a metalclad compartment. A linkage connected to
the cross shaft extends a détente angle (item 3, Figure 19)
out through the left side of the mechanism frame when the
breaker contacts are in the closed position. If the breaker is in
the “CONNECT” or “DISCONNECT/TEST” position in the
metalclad the détente angle locks into the racking mechanism
to prevent access to the hex section of the racking screw.
4.2.5 Closing Spring Gag Interlock
The interlock is provided to prevent a breaker that has a
gagged closing spring from entering a metalclad unit. This
function is accomplished by projecting an angle (item1, Figure
19) out of the left front side of the mechanism when the
closing spring is gagged. This angle will interfere with the
racking mechanism and block entry into the metalclad unit
when the Closing Spring Gag Access Door is open.