power distribution - Siemens

13SWITCHGEARLow Voltage SwitchgearType WL Low Voltage Metal-Enclosed SwitchgearSiemens Type WL low voltagemetal-enclosed switchgear is designed,constructed and tested to providesuperior power distribution, powermonitoring and control. At the heart of theType WL low voltage switchgear is theWorld Class Siemens WL breaker.Siemens Type WL low voltage switchgearcan be utilized in the followingapplications:▪ Industrial▪ Institutional▪ Critical Power▪ Utility and co-generation▪ CommercialProduct Scope▪ Equipment ratings635VAC Maximum3-Phase 3-Wire,3-Phase 4-Wire50/60 Hz6000 amp maximum horizontal bus5000 amp maximum vertical bus▪ Enclosure optionsNEMA 1 IndoorNEMA 3R Outdoor Walk-inNEMA 3R Outdoor Non Walk-inExclusive FeaturesGenerator/Utility Protection Sets24/7/365 power availability is critical forsome systems. On-site generationcapability is growing more and morecommon in many systems. All of the WLdigital electronic trip units allow thesystem designer to precisely tailor tripsettings for the most demandingrequirements. However, the 755 and 776trip units allow one set of trip settings fora fully loaded utility feed and with asimple contact closure, the trip unittoggles to a second trip set tailored toprovide optimal generator protection. Thewide range of settings allows the WL toprovide protection for a minimalgenerator capacity for only essentialloads, through full backup for an entirefacility. This dual utility/generatorprotection capability in a single circuitbreaker allows the system designerunparalleled, costeffective flexibility.Type WL Low Voltage Metal-Enclosed SwitchgearExtended Instantaneous Protection(EIP – Patent Pending Feature)Another unique feature of the WL TripUnit, allows the system designer toachieve full selective trip coordination upto the short-time rating of the frame,while also allowing application of thebreaker up to the interrupting rating ofthe frame. EIP allows the WL breaker tobe applied up to the full withstand ratingof the breaker, for complete coordination,with a minus 0% short- time bandtolerance up to 85kA on Frame Size IIand 100kA on Frame Size III. Above faultcurrents of 20% higher than the fullshort-time rating, the WL breaker is selfprotecting, and the EIP function will tripthe breaker instantly to protect the frameand the system from these extremelyhigh currents, as high as 150 kA onFrame Size III. One added benefit is thatarc flash energy is greatly reduced in thishigh current region due to theinstantaneous trip response that EIPprovides.GeneralIndustry StandardsType WL switchgear with power circuitbreakers are designed, tested andconstructed in accordance with:▪ UL 1558—Metal-Enclosed Low VoltagePower Circuit Breaker Switchgear▪ ANSI C37.20.1—Metal-Enclosed LowVoltage Power Circuit BreakerSwitchgearWL drawout circuit breakers are designedfor continuous operation at 100% of theircurrent rating without the need forexternal heat sinks, and are in accordancewith:▪ UL 1066—Low Voltage AC and DCPower Circuit Breakers Used inEnclosures▪ ANSI C37.13—Low Voltage AC PowerCircuit Breakers Used in EnclosuresFor more information, please visit http://automation.usa.siemens.com/consultant/ or contact your local sales office.13-42Siemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog