The 4AM3442-5AT10 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, delivering 230VAC at 0.43A from a 400V±5% three-phase panel supply. It powers 230V-rated contactor coils, relay logic, pilot lights, and solenoid valves directly — eliminating the need for a downstream DC power supply in simpler control schemes.

230V Direct Control Architecture

Many IEC-market panels run control circuits at 230VAC rather than 24VDC. This simplifies the bill of materials: no DC power supply, no DC-rated breakers, and a single voltage level throughout the control cabinet. The 310VA S6 short-time rating guarantees clean contactor pull-in even with multiple coils energizing simultaneously, preventing the voltage dip that can cause chatter or dropout.

Panel Integration

The EI 84/42 laminated core achieves 86% efficiency with Class B insulation for 40°C operation. IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715). Screw-type terminals accept ring or fork lugs. The ±5% primary taps (380/400/420V) accommodate site voltage variations. Certified to EN 61558-2-2 and EN 61558-2-6 with CE, cRUus, and EAC approvals.

Key Decision Parameters