The Siemens SITAS 4AM4642-5AT10-0FA1 is a compact 400 VA single-phase control transformer that steps down 400 V primary to 230 V secondary for small industrial control circuits. Delivering 1.74 A continuous with 1440 VA short-term capacity, it reliably powers contactor coils, relays, timers, and PLC power supplies in automation panels and machine control systems.

Key Features

• Cage-clamp terminals enable fast, tool-free wiring — reducing panel assembly time
• Adjustable primary voltage taps at 380/400/420 V (±5%) compensate for supply voltage variations
• Low inrush current design simplifies primary-side protection coordination
• Compact EI 120/52 core construction: 122 × 121 × 114 mm footprint fits tight panel spaces
• 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 compact transformer is designed for supplying control circuits in small-to-medium industrial machinery, control panels, HVAC systems, and building automation where a 400 VA single-phase supply is adequate. The cage-clamp terminals reduce wiring time during panel assembly, while the compact EI-core footprint fits DIN rail and panel layouts with limited space. The ±5% adjustable primary taps provide adaptability for installations with fluctuating mains voltage.