The Siemens 4AM6542-8ED40-0FA0 is a 2.5 kVA single-phase multi-tap control transformer from the SITAS series, with a three-tap primary accepting 525 V, 550 V, or 575 V input. It is the higher-voltage counterpart to the 8DD40 variant, covering mains standards found in specific industrial sectors and regional grids — including Canadian 575 V systems and certain European heavy-industry 550 V installations. A single part number supports multiple deployment voltages, simplifying procurement and spares management.

Electrical Performance

Regardless of the tap selected, the transformer delivers a stable 230 V secondary at up to 10.9 A for control circuits. The 13.3 kVA S6 short-time rating handles the combined inrush of contactor coils, relays, and solenoid valves without voltage sag. Low switch-on inrush is inherent to the SITAS EI-core design. Efficiency reaches approximately 96% at full load with a relative short-circuit voltage of 1.64%.

Construction and Compliance

Built on the EI 192/110 laminated core shared across the 4AM6542 series, with electrically isolated windings and Class B (130°C) insulation limiting temperature rise to 40 K. Complies with EN 61558-2-1, EN 61558-2-2, and EN 61558-2-4, with UL/CSA recognition and CE/UKCA marking. The IP00 open-frame design mounts via screws inside a control cabinet. Dimensions: 180 × 194 × 178 mm (H×W×D), net weight approximately 27 kg.

Related Products in the SITAS Series

The 4AM6542-8DD40-0FA0 covers the 480–525 V range for lower mains voltages. For single-voltage applications, the 4AM6542-5FT10-0FA0 (500 V) and 4AM6542-5MT10-0FA0 (690 V) offer simpler tap arrangements. All share the same 2.5 kVA SITAS core platform with identical efficiency, insulation, and S6 performance.