Negative Interlock; Positive Interlock Bar; Closing Spring Gag Interlock - GE PowerVac Instructions Manual

Vacuum circuit breaker with ml-20 mechanism

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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.

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.

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.

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