Emax Low voltage air circuit-breakers - ABB Download Center

Functions of the accessoriesThe table below lists a few functions that can be obtained byselecting the appropriate accessories from among those provided.Several of the functions listed may be needed at the sametime, depending on how the circuit-breaker is used. See therelative section for a detailed description of the individual accessories.FunctionComponentsRemote control• Opening release• Closing release• Geared motor for automatic charging of the closing springsRemote signalling or actuation of automatic functionsdepending on the state (open-closed-tripped) or position(racked-in, test isolated, racked-out) of the circuit-breaker.• Circuit-breaker open-closed auxiliary contacts• Circuit-breaker racked-in, test isolated, racked-out auxiliarycontacts (withdrawable circuit-breaker only)• Contact for electrical signalling of overcurrent release tripped• Contact for signalling undervoltage release de-energized• Contact for signalling springs chargedRemote opening for various needs, including:– manual emergency control– opening dependent on tripping of other interruptiondevices or system automation needs (1) .• Opening or undervoltage release5Automatic opening of the circuit-breaker for undervoltage(for example, when operating asynchronous motors)• Instantaneous or time delay undervoltage release (2)• Contact for signalling undervoltage release energizedIncreased degree of protection• IP54 door protectionMechanical safety locks for maintenance or functionalrequirements for interlocking two or more circuit-breakers• Key lock in open position• Padlock device in open position• Key lock and padlocks in racked-in, test isolated, racked-outpositionAutomatic switching of power supplies• Mechanical interlock between two or three circuit-breakers• Automatic transfer switches - ATS021-ATS022(1) Examples:– circuit-breakers on Low Voltage side of parallel transformers that must openautomatically when the Medium Voltage side device opens.– automatic opening for control by external relay (undervoltage, residual current, etc.).(2) The time-delay device is recommended when unwanted operation due to temporaryvoltage drops, is to be avoided (for functional or safety reasons).5/2ABB SACE