The Siemens SITAS 4AM4842-4TT10-0FA0 is a 500 VA single-phase 1:1 isolation transformer providing full galvanic isolation between a 230 V primary supply and a 230 V secondary output. Unlike voltage-changing control transformers, this unit maintains the same voltage level while eliminating ground loops, reducing electrical noise, and providing safety isolation — critical for sensitive control electronics and measurement circuits.

Key Features

• 1:1 galvanic isolation (230 V to 230 V) breaks ground loops and suppresses common-mode noise without changing voltage level
• Adjustable primary taps at 218/230/242 V (±5%) accommodate supply voltage variations
• 2000 VA short-term capacity (4× nominal) handles inrush from connected equipment
• Low inrush current design simplifies primary-side protection coordination
• Compact EI 120/72 core: 122 × 121 × 134 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 1:1 isolation transformer is designed for protecting sensitive control electronics, measurement instruments, and data acquisition systems from ground loops, electrical noise, and common-mode interference in industrial environments. It is commonly installed in control panels to isolate PLC and HMI power supplies, communication gateway devices, and precision measurement circuits from noisy mains supplies. The 500 VA rating supports multiple isolated devices while the compact EI-core footprint integrates easily into standard control panel layouts.