Thermistor protection [t-head2-col]

With thermistor motor protection, to DIN 44081 and DIN 44082, up to six PTC thermistor temperature sensors with a thermistor resistance of R_K ≤ 250 Ω or nine with a R_K ≤ 100 Ω can be connected to terminals T1-T2.

TNF= Nominal response temperature

Tripping range IEC 60947-8

Re-switch on range IEC 60947-8

Tripping at 3 200 Ω ±15 %

Re-switch on at 1500 Ω +10 %

The ZEV switches off at R = 3200 Ω ±15 % and switches on again at R = 1500 Ω +10 %. With switch off due to thermistor

input the contacts 95-96 and 97-98 switch over. Additionally, the thermistor trip can be programmed to different trip messages on contacts 05-06 or 07-08.

With temperature monitoring with thermistors, no dangerous condition can occur should a sensor fail as the device would directly switch off.