Siemens 4AM4042-8DD40-0FA0 SIDAC-T Power Supply

Siemens 4AM4042-8DD40-0FA0 SIDAC‑T SITAS is a one‑phase isolation/controls transformer rated at 250 VA, with two 115 V secondary windings and a highly versatile primary tap range suitable for a wide mains voltage spectrum. The primary supports taps at 550, 525, 500, 480, 460, 440, 415, 400, 380, 230, and 208 VAC, enabling operation from common industrial service voltages, while the secondary provides 2×115 VAC outputs. It delivers up to approximately 1.087–2.174 A on the secondary (per winding, with a combined capability up to 2.174 A) at 50/60 Hz, and offers a short‑term vector power rating around 850 VA. Built to EN 61558‑2‑1, ‑2‑2, ‑2‑4, the transformer has an insulation class B and a 40°C temperature rise, IP00 protection, and screw/flat‑type terminal connections. Mounting is compatible with DIN rail or mechanical screws for flexible panel installation, and the unit is UL/CSA‑recognized with CE/cRUus certification, reflecting Siemens’ SIDAC SITAS design family. This transformer is commonly used to isolate and power low‑voltage control circuits within industrial equipment and control panels, providing galvanic isolation and compatible voltage conversion from high‑voltage mains to safe 115 V control supplies.