36Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.complay and is forced to rotate exactly as much as the lever-ing device shaft rotates.Figure 30c shows the standard arrangement, without theinterlock screw, with the levering device arms in theCONNECT position. Note that there is a clearancebetween the back of the hook and Pin A. This permits theclose bar to be pushed to the “close” position and closethe breaker.In Figure 30d, all parts are in the same position as in Fig-ure 30c, except that the interlock screw has been placedin the “narrow slot”. This arrangement is shown in Figure25. This forces the interlock plate to rotate about 10degrees further than in Figure 30c, so that there is almostno 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 beremote-closed by applying control voltage to the springrelease coil through a control switch or other circuit-mak-ing device.5.1.8.3 Breaker Equipped for Electric LockoutPower operated breakers may be equipped for electriclockout, meaning that closing an unenergized circuit isprevented. This may be the main circuit or any otherdesired circuit. This is accomplished by making it impos-sible to release the spring release latch by the springrelease device unless the monitored circuit is energized.The spring release coil (SR) is wired through the contacton the motor cut-off switch that closes as the closingsprings become fully charged. The remainder of the cir-cuit is through a front panel closing pushbutton switchand to the terminals of the circuit being monitored. Thus,when the monitored circuit is energized properly, thebreaker may be closed through the panel pushbuttonswitch, provided in addition that the closing springs arecharged.As an additional safeguard against undesired closingunder this electric lockout condition, all such breakers willbe equipped with the interlock screw as described in Sec-tion 5.1.8.2 above. This prevents hand closing of thebreaker in the CONNECT position.Fig. 31 Close Interlock to Prevent Efforts to Close a Breaker that Is Already Closed.
