power distribution - Siemens

M4-PAN-TORXM4-PAN-TORXVL Circuit BreakersGeneral InformationSelectionThermal-Magnetic trip units, Model 525, combine the inverse time element design for low level overloads, and instantaneousmagnetic action for short circuit protection. The standard unit has preset overload protection and an adjustable instantaneous tripsetting, with 6 set points. Thermal-Magnetic trip units are available throughout the VL family, from 15 to 1600A.38503300I i440049502750 5500I n= 600A40 CTM ~Trip Unit/Disparador 525Type/Tipo CLT3Cat. No. CLT3B600Electronic Trip UnitsElectronic trip units are available throughthe VL family, from 60A (which can beset as low as 30A) up through 1600A .They are also available in four tripconfigurations (LI, LIG, LSI, LSIG) andfeatures can include a built-in LCDdisplay.On the Model 545 Electronic Trip Unit aflashing LED confirms that themicroprocessor in operating and anotherindicates an overload condition. Forease-of-use and to insure propercoordination, the set points for thecontinuous current are shown on theface of these trip units in amps.On the Model 576, the LCD version, thecurrent in each phase is continuouslyshown on the display. Unlike manydisplays, no secondary or auxiliary voltageis required as long as the breaker isenergized and a minimal load current ispresent. These trip units can also indicatethe “last trip” status (date, time,amps) when they‘re connected to a PCvia one of our communications modules.Typical Trip Unit Labeling and Adjustment PositionsModel 545 Electronic Trip Unitwith LSIG trip functionsModel 576 Electronic Trip Unithas an LCD display6MOLDED CASECIRCUIT BREAKERSSiemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog 6-95