The Siemens SITAS 4AM4042-5AT10 is a 250VA control transformer that steps down a 400V primary supply to 230V at 1.09A. It eliminates the need for a separate 230V feed in industrial panels, generating the 230V auxiliary supply directly from the 400V three-phase mains for powering cooling fans, instrumentation, single-phase outlets, and 230V-rated control components.

Voltage Configuration

The primary offers three taps at 380V, 400V, and 420V (±5%) to match site voltage conditions. The 230V secondary provides a standard single-phase auxiliary supply, making it a practical solution for panels where only 400V three-phase is available but 230V equipment must be powered.

Performance & Construction

Built on the EI 96/58 laminated core with 89% efficiency, the 850VA short-time (S6) rating handles inrush from motor-driven fans and contactor coils. The IP00 open-frame package (98×106×118mm) mounts via screws or 35mm DIN rail with screw-type or tab terminals.

Certifications

CE, cRUus (UL/CSA recognized), and EAC certified. Compliant with EN 61558-2-2 and EN 61558-2-4. Class B insulation for 40°C ambient operation.