Emax Low voltage air circuit-breakers - ABB Download Center

Earthing truckOther versionsEarthing truck- MTThis version is similar to the sectionalizing truck, but with the bottom or top isolating contactsreplaced by short-circuited, earthed connections. The earthing truck is available with bottom ortop isolating contacts, suitable for the fixed part of the size.The earthing circuit is dimensioned for a short-time withstand current equal to 60% of the maximumlcw of the circuit-breaker from which it is derived (IEC 60439-1).The truck is temporarily racked into the fixed part of a withdrawable circuit-breaker to earth thetop or bottom terminals before carrying out maintenance operations on the external circuit whenno residual voltages are expected to occur.21SDC200072F00011SDC200073F00011SDC200074F00011SDC200075F0001Other versionsOn request, SACE Emax circuit-breakers can be built in special versions designed for particularlyaggressive environments (SO 2/H 2S), for seismic installations or with the neutral pole on theright side.ABB SACE 2/11