The SITAS 4AM5742-8DD40-0FA0 is a 1000VA single-phase control transformer with a three-tap primary spanning 525/500/480V, stepping down to 230V at 4.35A. Part of the 4AM5742 series — the highest power rating in the SITAS single-voltage control transformer line — it serves control circuits in facilities where mains voltage ranges from 480V to 525V.

Electrical Performance

Rated at 1,000VA continuous with a short-time power rating of 5,000VA (S6 duty) — a 5x surge headroom for high-inrush loads from contactors, relays, and solenoid valves. The EI 150/90 laminated core achieves approximately 93 percent efficiency at full load. Full galvanic isolation between primary and secondary via II0 vector group.

Mechanical Design

Substantial 152x144x132mm IP00 open-frame construction for enclosure installation. Screw terminals on a screw-mount chassis. Class B (130 C) insulation system per IEC 60085, rated for 40 C ambient. Weighs approximately 15 kg.

Application

Typical applications include industrial control panels, machine tool automation, and process control systems where 230V control circuits must be supplied from 480-525V mains. The three-tap primary accommodates regional voltage variations without requiring separate transformer models.

Decision Parameters