The Siemens SITAS 4AM4342-4TN00-0EA0 is a 315VA safety isolating control transformer converting 230V primary to 24V secondary at 13.1A. The screw-mount variant (0EA0) of the 4TN00, it provides SELV-level 24V power for industrial control panels with the current capacity to drive extensive PLC I/O banks, multiple relay coils, HMI panels, and auxiliary 24V devices from a single transformer.

Electrical Performance

Built on the EI 105/60 core at approximately 90% efficiency, it delivers a 1,120VA short-time (S6) rating — 3.6x the continuous 315VA rating — for handling high-inrush loads. The 6.08% short-circuit voltage ensures stable output regulation. Primary taps at 218V, 230V, and 242V (+-5%) accommodate site voltage variation.

24V Control System Integration

At 13.1A, this transformer supports large control systems where multiple contactors, safety relays, PLC modules, and HMI devices share a common 24V supply. Combined with a rectifier and smoothing, it forms a robust 24VDC power backbone for machine and process control systems.

Construction & Certifications

IP00 open-frame, 107x111x120mm, 4.5kg, screw mounting. Certified to EN 61558-2-2 and EN 61558-2-6 with CE, cRUus, and EAC approvals. Class B insulation for 40 C ambient.