The CTA three phase motor-starter autotransformers are constructed in accordance with EN 60726 as applicable and approved UL/CSA File E309790.
During the design and engineering of ‘Autotransformer CTA was held particularly highlighted the problem of reducing the size of footprint.
The adoption of particularly valuable materials and advanced manufacturing technologies, have enabled the production of auto-sized particularly reduced in full compliance with the requirement of heat, electricity and regulatory environment. A further improvement of thermal characteristics is obtained with the particular process of impregnation cycle vacuum pressure with thermosetting resin in class F of the entire processor (winding, core and support fittings).
The winding is normally provided with 230V voltage and/or 400V. Connections are made with polyamide terminals thermosetting easily accessible. All auto are normally made in implementing open with a degree of protection IP00 or IP20 request. They can also be provided containers sheet steel with IP54 degree of protection in which case the power used must not exceed 80% of the rated output stated in the plate to keep the winding overtemperature within the limits prescribed by the rules.



  • Frequency-Rated
    The auto is designed for the frequency of 50Hz, but can also function properly at 60Hz and in the latter case, the powers of inspiration in tables are reduced by about 6%.
  • Tensions
    Tensions of entry are admitted voltage indicated by plateaffixed to the product.
    Output voltage: refer to the primary voltage rating, with nominal load and power factor of 1 (resistive load).

The voltage drops vacuum charged are contained, which can be available in high output power of short duration (of opportunity) needed for the operation of the engines. In the case of cyclic operation, however, if you use the full strength reported in the tables is necessary to limit the frequency of a drive maneuvers 250-300 per hour to meet the value of overtemperature admitted.
In “connecting the windings table” shows the names corresponding to the conventional connecting the windings, in the case of auto-linking is generally used as a star.

Verify that the temperature of the into the auto not exceed the limits prescribed by the rules.
Use the appropriate cables according to the current game and the capacity of the terminals. In addition to special care not to tighten the insulating sheaths under the terminal screws. In fact, a bad contact can lead to localized heating that can lead to damage to components.
The installation and replacement of transformers is to be performed by qualified persons.

icon Three phase autotransformer (158.39 kB)

icon Three phase autotransformer for starting motors approved UL/CSA (159.56 kB)

icon Assembly instructions (54.14 kB)