73Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.comSection 10 - Fixed Breakers10.0 GENERALFixed Breakers differ from the drawout version in thatthey do not have levering device, primary disconnectsand secondary disconnects. They do have padlock fea-ture to hold the breaker in “trip-free” position. Key inter-lock mounted in the location of levering device may alsobe supplied to insure proper sequence of operationbetween two or more breakers. This insures that beforethe interlock key can be removed to be used in anotherlocation the circuit breaker must be opened and held intrip-free position. The breaker stabs have holes for bolt-ing to the bus connections. Terminal blocks mounted atthe back of the breaker are used as secondary contacts.The frame is modified so that the breaker can bemounted on the panel.Section 11 - Drawout Dummy Elements11.0 GENERALA dummy element consists of a drawout frame or truckwith disconnecting contacts and with connecting linksbetween the upper and lower terminals on each pole.When inserted into a compartment it bridges the upperand lower stationary disconnecting contacts in eachphase, and is thus equivalent to an isolating disconnect-ing switch.It must be emphasized that a dummy is not a breaker,and has no current breaking ability whatsoever; there-fore, it is almost invariably key interlocked with a breakeror other load interrupting device, to insure that it will beisolated or at least carrying NO current before it can belevered out to the disconnected positions.Dummy element requires the same size compartmentsas those of equivalent type DS breakers of the sameframe sizes. The key interlock is of the same type andoperates in the same manner as that described in Sec-tion 9 for type DS-3200 and DS-4000 drawout fusetrucks.
