The Siemens SITAS 4AM4342-4TJ10 is a 315VA single-phase control transformer converting a 230V primary supply to 110V at 2.86A. Built on the larger EI 105/60 laminated core, it steps up from the 250VA class to deliver 315VA continuous and 1,120VA short-time (S6) — a 3.6x surge ratio for handling high-inrush contactor, relay, and solenoid loads in industrial control panels.

Voltage Configuration

The primary accepts 230V nominal with +-5% taps at 218V and 242V, accommodating supply voltage variations. The 110V secondary is a globally recognized control voltage standard for machinery and panel building, providing safe low-voltage operator interface power while maintaining sufficient energy for coil-driven devices.

Performance & Build

The EI 105/60 core achieves approximately 90% efficiency, an improvement over the smaller 250VA-class EI 96/58 design. The IP00 open-frame package measures 107x111x120mm and weighs approximately 4.6kg. Mounting is via screws with screw-type and flat tab terminal connections.

Certifications

Certified to EN 61558-2-2 (control transformers) and EN 61558-2-6 (safety isolating transformers) with CE, cRUus (UL/CSA recognized), and EAC approvals. Class B insulation (IEC 60085), 40 C ambient rated.