The Siemens SITAS 4AM5542-4TN00-0EA0 is an 800 VA single-phase safety isolating transformer that steps down 230 V primary to 24 V secondary for demanding low-voltage control circuits. Delivering 33.3 A continuous with 3400 VA short-term capacity, it reliably powers larger 24 V PLC systems, extensive sensor networks, multiple actuator rows, and control electronics in industrial automation panels requiring SELV/PELV safety isolation.

Key Features

• 24 V secondary at 33.3 A supplies high-current low-voltage control circuits with safe galvanic isolation
• Adjustable primary taps at 218/230/242 V (±5%) accommodate supply voltage variations
• 3400 VA short-term capacity (4.25× nominal) handles inrush from DC power supply charging and contactor coils
• Safety isolating transformer per EN 61558-2-6 — suitable for SELV/PELV circuits
• Low inrush current design simplifies primary-side protection coordination
• Compact EI 150/65 core: 152 × 144 × 126 mm footprint
• 50/60 Hz dual-frequency operation for global industrial power compatibility
• IP00 open-type construction for enclosed panel or cabinet mounting

Technical Data

Applications

This safety transformer is purpose-built for supplying 24 V SELV/PELV control circuits in larger industrial machinery, automation panels, and process control systems. The 33.3 A continuous rating supports installations with extensive 24 V loads — multiple PLC racks, distributed I/O stations, HMI panels, and industrial IoT gateways — all powered from a single transformer with full galvanic isolation. The 3400 VA S6 rating provides generous headroom for DC power supply inrush and momentary overloads during system startup.