The Siemens SITAS 4AM5542-5AT10-0FA0 is an 800 VA single-phase control transformer that steps down 400 V primary to 230 V secondary for industrial control circuits. Delivering 3.48 A continuous with 3400 VA short-term capacity and 93% efficiency, it reliably powers contactor coils, relays, solenoids, and control electronics in mid-size automation panels and motor control centers.

Key Features

• 800 VA continuous rating with 93% efficiency — the highest efficiency in the SITAS 4AM compact series
• Adjustable primary voltage taps at 380/400/420 V (±5%) compensate for supply voltage fluctuations
• 3400 VA short-term capacity (4.25× nominal) handles high inrush from contactor coils and relay banks
• Low inrush current design simplifies primary-side protection coordination
• Compact EI 150/65 core: 152 × 144 × 126 mm footprint
• 50/60 Hz dual-frequency operation for global industrial power compatibility
• IP00 open-type construction for enclosed panel or cabinet mounting

Technical Data

Applications

This transformer is designed for supplying control circuits in mid-size industrial machinery, motor control centers, conveyor systems, and automation panels where an 800 VA single-phase supply is required. The 93% efficiency minimizes heat generation in control panels, while the compact EI 150/65 footprint fits standard panel layouts. The ±5% adjustable primary taps provide adaptability for installations with fluctuating mains voltage, and the 3400 VA S6 rating handles inrush currents from contactor and relay loads.