The 4AM3842-8JD40-0FA0 is a 160 VA single-phase safety isolating transformer from the SITAS range, built to EN 61558-2-6. With three primary taps — 400 V, 385 V and 245 V — it connects directly to European 400 V three-phase supplies, older 380 V installations, or 230 V single-phase networks without additional autotransformers. On the secondary side, an independent 24 V winding powers the main control circuit, while a 2× 12 V winding can be configured for 12 V or an additional 24 V auxiliary supply, all from a single transformer.

Adaptable Input Voltage

• 400 V tap: direct connection to phase-to-phase voltage in 400 V three-phase systems — common in European industrial plants.
• 385 V tap: suits older 380 V networks still found in retrofits and brownfield sites.
• 245 V tap: for single-phase 230 V systems, simplifying global use and reducing stock complexity.

Safety and Dual Output

• Certified safety isolation: EN 61558-2-6 guarantees safe separation between primary and secondary circuits, enabling SELV/PELV control circuits where personnel protection is mandatory.
• Two independent secondary windings: winding 1 delivers 24 V (6.67 A) for contactors and relays; winding 2 delivers 2× 12 V (13.3 A total), configurable as 12 V, 24 V, or two separate 12 V supplies for sensors and auxiliary logic.
• 86 % efficiency: limits heat loss to approximately 22 W at rated load, compatible with ventilated control cabinets.

Technical Specifications