The Siemens SITAS 4AM4042-8JD40 is a 250VA multi-tap control transformer offering six primary voltage taps across two nominal ranges: 415V/400V/385V for 400V-class supplies and 245V/230V/215V for 230V-class supplies. The dual 115V secondary windings can be wired in series for 230V at 1.09A or parallel for 115V at 2.18A, giving panel builders maximum flexibility for global deployment.

Multi-Tap Primary: One Transformer, Many Sites

The +-15V tap range on both 400V and 230V nominal inputs allows this single transformer to cover a wide variety of site supply voltages. This reduces the number of transformer variants a panel shop needs to stock and simplifies global machine export, as the installer selects the appropriate tap during commissioning rather than specifiers ordering a different part number for each supply voltage.

Dual Secondary: Flexible Output

The two 115V secondary windings can be connected in series for 230V at 1.09A or parallel for 115V at 2.18A. This dual-configuration capability supports both 230V control circuits (Europe) and 115V control circuits (North America) from the same transformer model, when paired with appropriate primary tap selection.

Performance & Build

Built on the EI 96/58 core at 89% efficiency with 850VA short-time (S6) rating. IP00 open-frame, 98x106x118mm, 3.87kg. Screw or DIN rail mounting with screw-type and tab terminals.

Certifications

Certified to EN 61558-2-1, EN 61558-2-2, and EN 61558-2-4 with CE, cRUus, and EAC approvals.