The 4AM3442-8DD40 is a 100VA multi-tap single-phase control transformer from the Siemens SITAS 4AM series, offering 11 discrete primary voltage taps from 208V to 550V and dual 115V secondary windings. It combines control, safety isolating, and line transformer functions with maximum global voltage flexibility.

One Transformer, Many Voltages

Unlike the ±5% tapped single-voltage variants, the 8DD40 covers a broad spread of global supply voltages with dedicated primary taps: 550V, 525V, 500V, 480V, 460V, 440V, 415V, 400V, 380V, 230V, and 208V. This eliminates the need to stock multiple single-voltage transformers for different destinations. Panel builders and OEMs shipping to multiple regions can standardize on this one part number and configure the primary tap during commissioning.

Flexible Secondary

The dual 115V secondaries can be wired in series for a 230V output at 0.43A, or in parallel for a 115V output at 0.87A — adapting to both IEC 230V control circuits and North American 115V control standards from the same hardware. The 310VA S6 short-time rating handles contactor and relay inrush reliably across all configurations.

Panel Integration

The EI 84/42 core with Class B insulation delivers 86% efficiency at 40°C ambient. IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715), with screw-type terminals. Certified to EN 61558-2-2 and EN 61558-2-6 with CE, cRUus, and EAC approvals.

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