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Mors Smitt (Brand of Wabtec Company) – page 2

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RELAY: TYPE: ARC PROTECTION; COIL VOLTAGE: 110-125 VDC; CONTACT ARRANGEMENT: 2NO 1NC; CONTACT RATING: 100-110 VDC; ACTION: INSTANTANEOUS SWITCHING; TERMINAL: 12 PIN WIRING; MO{INT: FRONT PANEL, DIN RAIL; ENCLOSURE RATING: ZAI2 PLASTIC CASE; SPECIFICATION: IEC60255-0-2; UTILISED IN EITHER NEW INSTALLATIONS OR AS A SIMPLE RETROFIT IN EXISTING INSTALLATIONS, THE 1S2O PROVIDES HIGH SPEED DETECTION AND SIGNALLING OF ARC FLASH HAZARDS FOR APPLICATION IN AIR INSULATED METALCLAD SWITCHGEAR, ARC FAULT PROTECTION SCHEMES MAY BE IMPLEMENTED ON AN ARC ONLY BASIS, OR ALTERNATIVELY A CURR-ENT CHECK MAY BE EMPLOYED WHERE ADDITIONAL SECURITY IS WARRANTED, A CURRENT CHECKED SCHEME MAY BE IMPLEMENTED BY MAKING USE OF AVAILABLE PROTECTION RELAY LOGIC AND A FAST ACTING INSTANTANEOUS OVERCURRENT ELEMENT, SOME TYPICAL APPLICATION EXAMPLES ARE SHOWN ON THE APPLICATION PAGE TOGETHER WITH AN EXAMPLE SCHEMATIC, FOR FURTHER APPLICATION INFORMATION REFER TO THE 1S2O USER GUIDE, THE 1S2O IS PACKAGED IN THE, ZAI2 CASE THAT MAY BE FLUSH PANEL, SURFACE OR RAIL MOUNTED" A PLUG IN TERMINAL BLOCK IS PROVIDED TO ALLOW PANE,L PRE-WIRING, ARC FAULT TRIPPING USING CURRENT CHECK FAST OPERATION OF A TRTPPING SCHEME USUALLY RESULTS IN REDUCED SYSTEM SECURITY, THE ARC DETECTION METHOD CAN HOWEVER, COMBINE, THE 1S2O OPTICAL DETECTION TECHNIQUE WITH A TRADITIONAL OVERCURRENT METHOD TO MAXIMIZE SYSTEM SECURITY PARTICULARLY FOR BUS BAR PROTECTION SCHE,MES, BOTH CONDITIONS MUST CO-EXIST FOR THE TRIP CONDITION TO BE MET AS DEPICTED IN FIGURE 3, ARC DETECTION RESET TIME (EFFECT OF MULTIPLE ARC TRIPS) A DELAY OF 25 IS REQUIRED TO RESET THE I S2O AFTER AN INITIAL ARC SENSOR TRIP SUBSEQUENT ARC DETECTION WILL CAUSE THE TRIP OUTPUT CONTACTS TO RE-OPERATE
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