Tab 16.book - Piti Group

www.SquareD.comFor the most up-to-date informationThermistor Protection UnitsRelays and AccessoriesLT3 thermistor protection units continuously monitor the temperature of the machines to be protected (motors,generators, etc.) by means of PTC thermistors embedded in the machine windings.If the nominal operating temperature of the probes is reached, the probes convert the rapid increase in resistance into aswitching function which can be used to open the control circuit or signal a fault. Thermistor protection relays provideadditional motor protection and should be used to supplement a conventional current sensing overload relay.The choice of PTC thermistor probe to be incorporated in the motor winding depends on the insulation class, the type ofmotor and the most suitable location for the probe. This choice is usually made by the motor manufacturer or the motorrewinder, who have all the necessary information.Protection relays (without fault memory)LT3SE00MUnits with automatic reset without thermistor short circuit detectionVoltage/Frequency Output Contact Catalog Number Price115 Vac–50/60 Hz 1 N.C. LT3SE00F $124.230 Vac–50/60 Hz 1 N.C. LT3SE00M 124.24 Vdc 1 N.C. LT3SE00BD 124.Units with automatic reset with thermistor short circuit detection fault signalling indicatorVoltage/Frequency Output Contact Catalog Number Price230/115 Vac–50/60 Hz 1 N.O. –1 N.C. LT3SA00M $161.24–48 Vdc 1 N.O. –1 N.C. LT3SA00ED 161.24–230 Vac–50/60 Hzor 24–230 Vdc2 SPDT LT3SA00MW 161.Protection relays (with fault memory)LT3SA00MUnits with automatic reset without thermistor short circuit detectionVoltage/Frequency Output contact Catalog Number Price24–48 Vac–50/60 Hz 1 N.O.–1 N.C. LT3SM00E $227.115/230 Vac–50/60 Hz 1 N.O.–1 N.C. LT3SM00M 227.400 Vac–50/60 Hz 1 N.O.–1 N.C. LT3SM00V 227.24–48 Vdc 1 N.O.–1 N.C. LT3SM00ED 227.24–230 Vac–50/60 Hzor 24–230 Vdc2 SPDT LT3SM00MW 227.PTC thermistor probesDescriptionNominal operatingtemperature (°C)Sold in lots of Catalog Number PriceIntegrated triple probe 90 10 DA1TT090 $3.30110 10 DA1TT110 3.30120 10 DA1TT120 3.30130 10 DA1TT130 3.30140 10 DA1TT140 3.30150 10 DA1TT150 3.30160 10 DA1TT160 3.30170 10 DA1TT170 3.30Surface probes 60 10 DA1TS060 3.3070 10 DA1TS070 3.3080 10 DA1TS080 3.3090 10 DA1TS090 3.30100 10 DA1TS100 3.30Dimensions3.941003.86983.94100.902316IEC STYLE CONTACTORSAND STARTERSFor additional information, reference Catalog #9110CT9701.© 2003 Schneider ElectricAll Rights Reserved9/8/03I11DiscountSchedule16-239/8/03