The 4AM3442-5AT10-0FA1 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, an ordering variant of the 5AT10 that delivers 230VAC at 0.43A from a 400V±5% three-phase panel supply. It carries the same electrical and mechanical specifications as the -0FA0 variant under a different commodity code for procurement flexibility.

Identical Electrical Performance

Like all SITAS 4AM3442 transformers, this unit combines control, safety isolating, and line transformer functions. The 310VA S6 short-time rating handles multiple contactor and relay inrush events simultaneously. The EI 84/42 core with Class B insulation delivers 86% efficiency and reliable operation at 40°C ambient on a 35mm DIN rail or screw-mounted inside the enclosure.

When to Specify This Variant

The -0FA1 suffix distinguishes this ordering code from the more common -0FA0. Engineers specifying replacement units or building to an existing BOM with this exact part number should use this code to maintain consistency across panel documentation and spares inventory. All certifications — EN 61558-2-2, EN 61558-2-6, CE, cRUus, EAC — are identical across both variants.

Key Decision Parameters