The SITAS 4AM3242-8JD40-0FA0 has the widest primary voltage spread in the 63VA SITAS multi-tap range: 245V, 385V, and 400V taps on the same primary winding. This configures the transformer for two fundamentally different supply scenarios — a 230V single-phase mains (connected to the 245V tap, accounting for typical grid overvoltage) or a 400V three-phase feeder (connected phase-to-phase on the 400V tap). The 385V tap bridges installations where the measured voltage sits between the two extremes.

One Transformer, Two Supply Scenarios

In practice, the 8JD40 covers a common panel-building dilemma. A machine may be installed in a facility with a 230V single-phase supply available at the control panel location, or in a plant where only a 400V three-phase feed is present. Rather than stocking two transformer part numbers and selecting at installation, the panel builder fits the 8JD40 and the commissioning engineer connects to the appropriate tap based on the available supply. The secondary delivers a consistent 230V at 0.27A regardless of which primary tap is used.

Platform Consistency

The transformer retains the full SITAS 63VA specification: EI 84/28 core, 86×98×90mm, 85% efficiency, 190VA S6 short-time rating, 8.4% uk, II0 vector group, 50/60Hz, safety isolating per EN 61558-2-6, CE/UL/CSA/cRUus certified, thermal class B, IP00. The mechanical and thermal characteristics are identical to every other 63VA model — only the primary tap arrangement changes.

Key Decision Parameters

For the 24V secondary equivalent of the same multi-tap primary range, see the 4AM3242-8JN00-0EA0.