Technical SpecificationsItem no. 10300017, Revision 10 17 ( 36 )6.4 Motor protection PTC 100°CPTC thermistor with protective insulationCharacteristic curves for rated response temperatures 90°C to 160°C in accor-dance with DIN VDE V 0898-1-401.Positive temperature coefficientthermistor resistance (RPTC)according to the positivetemperature coefficient thermistortemperature (TPTC) (small-signalresistance).Technical SpecificationsType M135Max. operating voltage (TA = 0 … 40°C) V max. 30 VMax. measuring voltage (TA – 25 K … TNAT + 15 K) V Meas, max 7.5 VNominal resistance (VPTC ≤ 2.5 V) RN ≤ 250 ΩInsulation test voltage Vis 3 kV~Response time ta < 2.5 sOperating temperature range (V=0) Top -25/+180°CResistance valuesTNAT ±ΔT R (TNAT – ΔT)(VPTC ≤ 2.5 V)R (TNAT – ΔT)(VPTC ≤ 2.5 V)R (TNAT + 15 K)(VPTC ≤ 7.5 V)R (TNAT + 23 K)(VPTC ≤ 2.5 V)100 ±5°C ≤ 550 Ω ≥ 1330 Ω ≥ 4 kΩ ----6.5 ESD protectionESD protection is provided by creating an electrically conductive connectionbetween the rotating shaft of the HF spindle and the motor housing.q Depending on the operating time, the electrical resistance of this slidingcontact is <1 kΩ.q The wear on the sliding contact is not monitored.