The Siemens SITAS 4AM2642-4TT10 is a 40 VA 1:1 isolating transformer — the next step up from the 25 VA 4AM2342 series, delivering 60% more power in a still-compact form factor. It provides galvanic isolation between a 230 V supply and a 230 V load, with ±5% primary taps for voltage matching. At 80 × 68 × 75 mm and approximately 1.0 kg, it fits easily in standard control panels where floating power is needed for multiple small instruments or a group of noise-sensitive devices. The improved 76% efficiency reflects the larger EI 66 core optimized for the 40 VA power class.

Key Features

• 1:1 galvanic isolation — 230 V to 230 V with full primary-secondary separation
• ±5% primary taps (218/230/242 V) for site voltage compensation
• 40 VA continuous — suitable for 2–3 small control devices
• Compact 80 × 68 × 75 mm, ~1.0 kg
• 76% efficiency, 50/60 Hz, IP00
• UL/CSA recognized, screw/tab terminals, DIN rail or screw mount

Technical Data

Applications

Control panels requiring floating power for multiple instruments: isolated supplies for communication converters, analog signal isolators, small HMI panels, and measurement transducer circuits. The 40 VA rating supports 2–3 simultaneously powered small devices on an isolated supply.