Emax Low voltage air circuit-breakers - ABB Download Center

Shunt opening and closing release(1) The minimum impulse current durationtime in instantaneous service mustbe 100 ms(2) If the opening release is permanentlyconnected to the power supply, wait atleast 30 ms before sending the commandto the shunt closing release.1SDC200131F00011a) Shunt opening and closing release (YO/YC)and second opening release (YO2)Allows remote control opening or closing of the apparatus, depending on the installation positionand connection of the releases on the support. The release can, in fact, be used for eitherof these two applications. Given the characteristics of the circuit-breaker operating mechanism,opening (with the circuit-breaker closed) is always possible, whereas closing is onlypossible when the closing springs are charged. The release can operate with direct current oralternating current. This release provides instantaneous operation (1) , but can be powered permanently(2) .Some installations require very high safety in controlling circuit-breaker opening remotely. Inparticular, the control and opening release circuits must be duplicated. To meet these needs,SACE Emax circuit-breakers can be equipped with a second shunt opening trip unit, fitted witha special support to hold it, that can house the standard shunt closing and opening releases.The seat of the second shunt opening release is that of the undervoltage release, which istherefore incompatible with this type of installation. The special support, including the secondshunt opening release, is installed in place of the standard support.The technical specifications of the second shunt opening release remain identical to those ofthe standard shunt opening release.When used as a permanently powered closing release, it is necessary to momentarily deenergizethe shunt closing release in order to close the circuit-breaker again after opening (thecircuit-breaker operating mechanism has an anti-pumping device).Reference figure in electrical circuit diagrams: YO (4) - YC (2) - YO2 (8)51SDC200132F00011SDC200133F00011SDC200134F0001CharacteristicsPower supply (Un): 24 V DC 120-127 V AC/DC30 V AC/DC 220-240 V AC/DC48 V AC/DC 240-250 V AC/DC60 V AC/DC 380-400 V AC110-120 V AC/DC 440 ACOperating limits:(YO-YO2): 70% ... 110% Un(IEC EN 60947-2 Standards) (YC): 85% ... 110% UnInrush power (Ps):DC = 200 WInrush time ~100 msAC = 200 VAContinuous power (Pc):DC = 5 WAC = 5 VAOpening time (YO- YO2): (max) 60 msClosing time (YC):(max) 80 msInsulation voltage:2500 V 50 Hz (for 1 min)5/6ABB SACE