GE Industrial Solutions Power-Vac ML-20 Mechanism - Manual (Page 7)

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4.2.3 Negative Interlock
The function of this racking-track operated interlock (5, Figure
17) 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 breaker 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 (3, Figure 17) 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 (1, Figure 17)
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.