Thermistor motor protection devices are used for direct monitoring of the motor winding temperature. For this purpose, the motors are equipped with temperature-dependent resistors (PTC) that are directly installed in the motor winding and abruptly change their resistance at their limit temperature.

Versions

SIRIUS 3RN1 thermistor motor protection relays are available in the following versions:

• 3RN1000 compact evaluation unit
• 3RN1010, 3RN1011, 3RN1012, 3RN1013, 3RN1014 standard evaluation units
• 3RN1013-.BW01 bistable evaluation unit
• 3RN1022 evaluation unit for 2 sensor circuits “warning and disconnection”
• 3RN1062 evaluation unit for 6 sensor circuits “multiple motor protection”

The 3RN1 evaluation units are suitable for use in any climate and are finger-safe according to IEC 60529.

They comply with

• IEC 60947-8. Low-voltage switchgear and controlgear – Part 8: "Control units for built-in thermal protection (PTC) for rotating electrical machines"
• IEC 61000-6-2, IEC 61000-6-4. "Electromagnetic compatibility for industrial-process measurement and control equipment"

The terminals of the auxiliary contacts are designated in accordance with EN 60947-1.

The 3RN1 evaluation units are suitable for snap-on mounting onto TH 35 standard mounting rails according to IEC 60715 or for screw fixing using an adapter (Accessories).

Any mounting position is possible.

Article No. scheme

Note:

The article number scheme shows an overview of product versions for better understanding of the logic behind the article numbers. For your orders please use the article numbers quoted in the selection and ordering data.