TZLM transformers are designed to power relay protection circuits against ground fault of individual cores of a three-phase cable by transforming zero-sequence currents. Transformers are installed on the cable: with a diameter of up to 70 mm - TZLM-1, with a diameter of up to 100 mm - TZLM-1-1 and TZLM-1-2.

Transformers are manufactured in "U" or "T" version of category 2 in accordance with GOST 15150 and are designed to operate under the following conditions:

- height above sea level is not more than 1000 m;

- ambient temperature is given in the table;

- the environment is non-explosive, does not contain dust, reactive gases and vapors in concentrations that destroy metal coatings and insulation (type II atmosphere according to GOST 15150);

- working position - any.