Emax Low voltage air circuit-breakers - ABB Download Center

Installation in switchgearChoosing the type of circuit-breakerConnecting the main circuit-breakercircuitsWhen designing switchgear, one must always bear in mind theproblem of making the most rational connections between thecircuit-breaker and main busbar system and from the busbarsto the users. The SACE Emax series offers switchgear manufacturersa range of options to satisfy different circuit-breakerconnection requirements.The figures below give some indications for terminal selection.Horizontal rear terminalsVertical rear terminalsFront terminalsFlat rear terminals3For switchgear with access fromthe rearFor switchgear with access fromthe rearFor wall-mounted switchgear,with access from the front only(withdrawable version only) Forswitchgear with access from therearDegrees of protectionA number of solutions have been adopted on SACE Emax circuit-breakersto achieve IP20 degree of protection for fixed orwithdrawable circuit-breakers, excluding the terminals, and IP30for their front parts using a flange. Automatic shutters have beendesigned for the fixed parts of withdrawable circuit-breakerswhich can be locked using padlock devices to allow maintenanceon the load side or on the power-supply side of the fixedpart.A transparent protective cover is also available on request, tocompletely segregate the front of the circuit-breaker, reachingIP54 degree of protection. In any case, the front panel and protectiontrip unit with the relative indications remain completelyvisible.IP20 Fixed or withdrawable version circuit-breaker, excludingthe terminals.IP30 Front parts of the circuit-breakers (using a flange).IP54 Fixed or withdrawable version circuit-breaker, fitted withtransparent protective cover to be fixed onto the frontof the switchgear (on request).1SDC200089F00013/4ABB SACE