Autotransformer three-phase fan speed controllers Rated current SEC: Rated voltage PRI: Control type: Autotransformer fan speed controllers (two transformers in Vconnection) serve the purpose of airflow control in three-phase fan motors controlled by voltage. Open version, designed for installation in industrial ventilation or heating systems. A five-stage output voltage available from the subsequent taps of the autotransformer, led out to the electrical connector. Made with Class I insulation and protection grade IP00. Maximum ambient temperature 40°C, thermal class of insulation B (130°C). Manufactured in compliance with EN61558-2-13. WIRING DIAGRAM ul. Postępowa 25/27, 93-347 Łódź, Poland tel. (42) 640-15-39, fax: (42) 640-15-41 [email protected], www.brevetrafo.com Due to the constant development of the construction and changes in technical requirements, Breve Tufvassons reserves the right to change the above paramete