Siemens - Temp.-meetrelais (motorbeveiliging) 3Rn20121Ba30 - 3RN20121BA30

thermistor motor protection relay standard evaluation unit 22.5 mm enclosure screw terminal 2 changeover contacts Us = 24 V AC/DC manual/auto/remote RESET with ATEX approval 2 LEDs (ready/tripped) electrical isolation test/RESET button wire-break monitoring short-circuit monitoring non-volatile for protecting motors against overheating, including in potentially explosive atmospheres, by means of direct temperature measurement with ATEX approval Direct measurement of the motor winding temperature means that the motor is protected even under abnormal conditions such as heavy starting, braking mode, frequent switching or insufficient cooling, and therefore renders precautionary over-dimensioning of the motor unnecessary. The devices can be used to protect motors in atmospheres where there is a possibility of gas or dust explosions. It is not necessary to set device parameters as PTC sensors are used.