The 4AM3442-4TJ10-0FA0 is a 100 VA single‑phase safety isolating transformer from the SITAS range, built to EN 61558-2-6. It provides safe galvanic isolation between the 230 V mains and the 24 V control circuit, with the primary side offering ±5 % taps (218 V / 230 V / 242 V) for adapting to fluctuating supply voltages. On the secondary side you get an independent 24 V winding and a further 2× 12 V winding — so a single device can supply the 24 V control voltage and still provide 12 V or an additional 24 V for auxiliary circuits without requiring a second transformer.

Safety and Flexibility

• Certified safety isolation: complies with EN 61558-2-6, ensuring that the 24 V side is safely separated from the mains — a prerequisite for SELV and PELV circuits in control cabinets.
• Dual secondary outputs: winding 1 delivers 24 V (4.17 A), winding 2 delivers 2× 12 V (8.33 A), covering a wide range of contactors, relays, and sensors from a single transformer.
• Adjustable primary taps: 218 V, 230 V and 242 V connections allow fine adjustment of the output voltage when the supply network deviates from nominal, keeping the secondary at the correct level.

Built for Industrial Control

• 86 % efficiency: keeps heat loss low at approximately 14 W at rated load. Combined with Class B insulation (130 °C) and an 80 K temperature-rise limit, the transformer runs reliably within the thermal limits of a ventilated control cabinet.
• Robust EI 60/30 core: screw‑mounted iron core with a net weight of 2.2 kg, designed for stationary installation inside an enclosure (IP00).
• Operating temperature: -20 °C to +50 °C, covering factory and outdoor kiosk installations.

Technical Specifications