Breaker Equipped For Electric Lockout; Close Interlock To Prevent Efforts To Close A Breaker That Is Already Closed - Eaton DS-206S series Instructions Manual

Instruction Booklet IB 33-790-1J
Effective November 2010
play and is forced to rotate exactly as much as the lever-
ing device shaft rotates.
Figure 30c shows the standard arrangement, without the
interlock screw, with the levering device arms in the
CONNECT position. Note that there is a clearance
between the back of the hook and Pin A. This permits the
close bar to be pushed to the "close" position and close
the breaker.
In Figure 30d, all parts are in the same position as in Fig-
ure 30c, except that the interlock screw has been placed
in the "narrow slot". This arrangement is shown in Figure
25. This forces the interlock plate to rotate about 10
degrees further than in Figure 30c, so that there is almost
no clearance between Pin A and the back of the hook.
Consequently the Close bar cannot be pushed to the
"Close" position. However, the breaker can be
remote-closed by applying control voltage to the spring
release coil through a control switch or other circuit-mak-
ing device.
Fig. 31 Close Interlock to Prevent Efforts to Close a Breaker that Is Already Closed.
36
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Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL

5.1.8.3 Breaker Equipped for Electric Lockout

Power operated breakers may be equipped for electric
lockout, meaning that closing an unenergized circuit is
prevented. This may be the main circuit or any other
desired circuit. This is accomplished by making it impos-
sible to release the spring release latch by the spring
release device unless the monitored circuit is energized.
The spring release coil (SR) is wired through the contact
on the motor cut-off switch that closes as the closing
springs become fully charged. The remainder of the cir-
cuit is through a front panel closing pushbutton switch
and to the terminals of the circuit being monitored. Thus,
when the monitored circuit is energized properly, the
breaker may be closed through the panel pushbutton
switch, provided in addition that the closing springs are
charged.
As an additional safeguard against undesired closing
under this electric lockout condition, all such breakers will
be equipped with the interlock screw as described in Sec-
tion 5.1.8.2 above. This prevents hand closing of the
breaker in the CONNECT position.