The Siemens SITAS 4AM4342-5AT10 is a 315VA control transformer converting a 400V primary supply to 230V at 1.37A. As the higher-power alternative to the 250VA 4AM4042-5AT10, it provides 26% more continuous capacity for industrial panels requiring a 230V auxiliary supply derived from the 400V three-phase mains, powering cooling fans, instrumentation, single-phase outlets, and 230V-rated control components.

Voltage Configuration

Primary taps at 380V, 400V, and 420V (+-5%) match varying site grid conditions. The 230V secondary eliminates the need for a separate single-phase feed in panels where only 400V three-phase is available. At 1.37A secondary current — up from 1.09A in the 250VA version — it supports additional 230V loads on the same transformer.

Performance & Build

EI 105/60 laminated core at ~90% efficiency, a significant improvement over the EI 96/58 used in the 250VA class. The 1,120VA short-time (S6) rating — 32% higher than the 850VA of the 250VA equivalent — handles inrush from multiple motor-driven fans and contactors. IP00 open-frame, 107x111x120mm, screw mounting.

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.