The Siemens SITAS 4AM4042-4TJ10 is a 250VA single-phase control transformer that converts a 230V primary supply to a 110V secondary output, delivering 2.27A continuous for industrial control circuit loads. It is built on the EI 96/58 laminated iron core and achieves 89% efficiency at full load, with an 850VA short-time (S6) rating for high-inrush contactor, relay, and solenoid startup.

Voltage Configuration

The primary accepts 230V nominal with ±5% taps at 218V and 242V, accommodating supply voltage fluctuations common in industrial environments. The 110V secondary is widely used for control circuits in machinery and panel building across global markets.

Mechanical Design

Housed in an IP00 open-frame package measuring 98×106×118mm and weighing 3.75kg, it mounts via screws or 35mm DIN rail (EN 60715). Screw-type and flat tab terminals provide flexible wiring options. The Class B insulation system (IEC 60085) supports operation up to 40°C ambient with a 40K temperature rise.

Certifications & Compliance

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 for global deployment.