4Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.comSafety FeaturesType DS (DSL) Breakers are manufactured with severalbuilt-in interlocks and safety features to reduce hazardsand provide proper operating sequences. UNDER NOCIRCUMSTANCES SHOULD THEY BE MADE INOP-ERATIVE AS THIS MAY RESULT IN BODILY INJURYOR PROPERTY DAMAGE.1. Positive mechanical indicators on front panel showwhether the breaker is open or closed, and whetherthe closing spring is charged or discharged.2. Closing Spring Automatic Discharge - Mechanicalinterlocking automatically discharges the closingsprings when the breaker is removed from its com-partment.3. Mechanical interlocking prevents levering of breakerunless its contacts are open. Contacts cannot beclosed until the breaker is levered into TEST or CON-NECT positions.4. Mechanical interlocking prevents closing of breakercontacts while it is being levered into or out of its cell,or while it is standing in any intermediate locationbetween the TEST and the CONNECT positions orthe DISCONNECT position.5. Provisions for Padlocking-Breakers can be padlockedopen to prevent electrical or manual closing. Thispadlocking can also secure the breaker in the con-nected, test, or disconnected position by preventinglevering.6. In the CONNECT position automatic mechanicalinterlocking prevents the disconnecting or withdrawalof a closed breaker. This avoids drawing dangerous,destructive arcs on the disconnecting contacts whenthe circuit is energized.7. In the REMOVE position mechanical interlock systemprevents the closing springs from being charged orremaining charged.8. The integral fuses on Types DSL-206 and DSL-416breakers are inaccessible until the breaker is com-pletely withdrawn from its compartment, therebyassuring complete isolation.Likewise, the Type DSL-632 and DSL-840 fuses are inac-cessible until the separate fuse truck is completely with-drawn and the fuses isolated. The fuse truck is keyinterlocked with the breaker to prevent withdrawing orinsertion unless the breaker is open.
