INT69 Motor protector

• Article No.

  22 A460

• Application

  Because of the compact dimensions, the robust construction and the high ambient temperature resistance the motor protector INT69 is suitable for the mounting into the terminal box of an electric motor. It is characterized by high reliability and availability.

• Functional description

  Up to 9 PTC-sensors according to DIN 44081/082 with different nominal response temperatures can be connected in series to the measuring circuit input of INT69. Hence it is possible to monitor one or several motor drive units (e.g. motor windings, gear drives, shaft bearings) for thermal overload with only one INT69 motor protector. If the temperature in one of the areas monitored exceeds the nominal response temperature of the respective PTC-sensor, the sensor resistance increases and the INT69 motor protector switches the motor contactor off. After fall below back switch-point the modul resets. The relay switch output is designed as a potential free change-over contact. This switching circuit function according to the closed-circuit principle, i.e. the relay drops back to the reset position also in case of sensor or cable failure and shuts off.