The Siemens SITAS 4AM4642-8JD40-0FA0 is a compact 400 VA single-phase control transformer with a 6-tap primary covering 215 V to 415 V, including the 400/385/245 V inputs. Dual 2 × 115 V secondary windings can be series-wired for 230 V at 1.74 A or parallel-wired for 115 V at 3.48 A. The 245 V tap makes this unit particularly suitable for installations derived from 3-phase 415 V systems where the phase-to-neutral voltage is approximately 240 V.

Key Features

• 6-tap primary (215-415 V) covers common IEC mains voltages including 400/385/245 V inputs
• 245 V tap ideal for 415 V 3-phase systems where control power is derived phase-to-neutral
• Dual secondary: series for 230 V or parallel for 115 V with doubled current capacity
• Low inrush current design simplifies primary-side protection coordination
• Compact EI 120/52 core: 122 × 121 × 114 mm 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 transformer is designed for supplying control circuits in industrial machinery and automation panels operating on IEC-standard 400 V or 415 V 3-phase mains, where the 245 V tap provides an optimal match for phase-to-neutral derived control power. The 6-tap primary covers common European and Asian mains voltages, while the dual secondary supports both 230 V and 115 V control standards. The 1440 VA short-term rating handles inrush from contactor coils and relay banks in compact panel installations.