Eaton DS-206S series Instructions Manual

Contents

37Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.comManually operated breakers may also be furnished withthis feature if they are equipped with optional electricalspring release devices.5.1.8.4 Closed Breaker InterlockFigure 31 shows how operation of the spring releaselatch is prevented when the breaker already is in theclosed position. The Close Bar is connected to the springrelease latch by a link and bell crank. The link is pivotedon the lower end of the close bar cam by a pin as shown.As the Close Bar is pushed, the pin and latch link willmove to the right, along with the lower end of the cam.The lower end of the link is facing a knife edge pivot onthe vertical arm of the bell crank. The upper end of thelink is facing the Open-Close Indicator Pin. This pin is atthe left end of its slot in the mechanism side frame withthe breaker open and at the right end with the breakerclosed. As the Close Bar is pushed, the link therefore hastwo possible end pivots. If the breaker is open the upperend of the link will swing to the right until it touches theindicator pin. The lower end of the link will then swing tothe right and push the vertical arm of the bell crank to theright. The horizontal arm of the bell crank moves down-ward and presses directly on the spring release latch,allowing the breaker to close.If the breaker already is closed and the Close Bar ispushed, the upper end of the spring release latch link willswing free to the right because the indicator pin is notthere to stop it. Consequently, no force is applied to thevertical arm of the bell crank, and nothing else happens.5.1.8.5 Padlocking ProvisionFigure 32 shows the essential parts of the padlock inter-lock. The breaker is padlocked in the trip-free condition inwhich the breaker cannot be closed and the breaker can-not be moved with the levering device. This figure showsthe relation of parts for padlocking in the trip-free, shutterup condition. There are three major parts involved, whichare interleaved and assembled on the left hand side ofthe levering device assembly:1. The Shutter;2. The Trip Plate; and3. The Padlock Interlock Lever.The Padlock Interlock lever is located between the TripPlate and the Padlock Plate, and is pivoted on a fixedcenter toward the rear of the breaker. The front part ofthis lever has a sloping slot into which a projection fromthe trip plate extends. Horizontal movement of the tripplate by cam action of the projection against the walls ofthe slot, causes the front of the interlock lever to move upor down. The interlock lever is pushed upward by aspring. This lever also has a short pin extending outwardnormally into a curved notch in the bottom edge of thepadlock plate.Fig. 32 Padlock Device - Locked Trip Free and ShutterRaised.To padlock the breaker, with shutter closed, push the tripplate in. Pull the padlock plate forward. This exposes thepadlock slot in the padlock plate. Insert the padlock andlock.Movement of the trip plate pushes the front end of thepadlock interlock lever down, moving its pin downwardand out of the notch in the padlock plate. Forward move-ment of the padlock plate and backward movement of thetrip plate places the pin in the padlock interlock leverbehind the notch in the padlock plate. With the padlockplate held forward, the padlock interlock lever cannotmove. The projection from the trip plate is consequentlyheld in the slot in the padlock interlock lever, so thebreaker remains locked in the trip-free condition until thepadlock is removed and the members are returned totheir normal positions by their return springs. While solocked, the shutter is prevented from downward travel bya horizontal projection striking a bent-over tab on thepadlock plate.61112