The Siemens SITAS 4AM4042-5FT10 is a single-phase control and isolating transformer purpose-built for 500 V AC industrial mains — a voltage level common in specific regional power networks and heavy machinery circuits. With ±5% primary taps at 475 V, 500 V, and 525 V, it accommodates supply voltage variations while maintaining a stable 230 V secondary output for control circuits, contactors, relays, and auxiliary equipment. The 850 VA short-time (S6) rating handles inrush currents from electromagnetic loads without voltage sag.

Key Features

• 500 V ±5% primary with three selectable taps for supply flexibility
• 850 VA short-time peak power for motor-start and inrush scenarios
• 89% efficiency at full load, low no-load losses
• IP00 open-frame design — DIN rail or screw mounting
• UL/CSA recognized for North American panel compliance
• 50/60 Hz operation for worldwide use

Technical Data

Applications

Typical use in control cabinets fed by 500 V industrial mains: motor control centers, machine tool control circuits, conveyor system auxiliary power, and process automation panels. The 230 V secondary directly powers standard DIN rail control relays, contactors, timers, and PLC power inputs.