The 4AM3442-5AJ10 is a 100VA single-phase control transformer from the Siemens SITAS 4AM series, stepping 400V±5% three-phase-derived mains down to 110VAC for control circuits. It delivers 0.91A continuous at 110V with 310VA S6 short-time capacity for inrush-heavy loads.

110V Control Voltage Applications

While 24V and 230V dominate control circuits globally, 110VAC remains the standard control voltage for UK construction site equipment, railway signaling systems, and industrial facilities following BS 7671 and BS EN 60204 guidance on reduced low voltage. This transformer provides the 110V control supply directly from a standard European 400V three-phase panel supply, eliminating the need for a separate site transformer.

Build and Compliance

The EI 84/42 laminated core with Class B insulation operates at 40°C ambient. IP00 open-style construction mounts via screws or 35mm DIN rail (EN 60715). Screw-type terminals accept ring or fork lugs. Certified to EN 61558-2-2 and EN 61558-2-6 safety isolating standards, with CE, cRUus, and EAC approvals.

Key Decision Parameters