The SITAS 4AM3242-8ED40-0FA0 addresses a specific multi-voltage requirement: control panels deployed across Canadian 575V industrial grids, European 550V heavy industry installations, and 525V marine electrical systems. A single transformer part number with three selectable primary taps covers all three voltages, delivering a consistent 230V secondary at 0.27A for contactor coils, relays, and control devices rated for line-voltage operation.

Multi-Tap vs. ±5% Tapped

Siemens differentiates between two tapping philosophies in the 4AM series. The 5-prefix models use a ±5% tap around a single nominal voltage — fine-tuning for site voltage variation. The 8-prefix multi-tap models provide discrete primary voltage selections spanning meaningfully different nominal voltages — 525V, 550V, and 575V are distinct distribution standards, not minor variations of the same grid. The installer selects the correct tap at commissioning by moving the supply connection to the labeled terminal that matches the measured line voltage.

Standard SITAS Platform

The transformer uses the same EI 84/28 core, 86×98×90mm footprint, screw/tab terminals, and 85% efficiency as every other 63VA SITAS model. The 190VA short-time rating supports contactor inrush. Safety isolation per EN 61558-2-6, II0 vector group, 50/60Hz operation, and CE/UL/CSA/cRUus certifications are standard across the series.

Key Decision Parameters

For the 24V secondary equivalent covering the same primary voltage range, see the 4AM3242-8EN00-0EA0. For ±5% tapped single-voltage variants, see the 5-prefix SITAS models.