The Siemens SITAS 4AM3842-8DN00 combines an 11-tap universal primary (208V to 550V AC) with a 24V AC SELV secondary at 6.67A, providing 160VA of safety isolating control power for machine builders and panel shops serving global markets. One transformer model covers North American 208V, European 400V, marine 440V, mining 500V, and Canadian 550V supplies — all delivering the same 24V SELV output for contactor coils, safety relays, and PLC I/O interfaces.

Universal Primary, Consistent 24V SELV Output

The eleven primary taps — 550/525/500/480/460/440/415/400/380/230/208V — allow the transformer to be configured at installation for the local supply voltage by connecting to the appropriate tap terminal. Regardless of which primary tap is selected, the secondary delivers a consistent 24V AC at 6.67A. This simplifies panel standardization: the same bill of materials works for machines shipped to different voltage regions, with only a field wiring change needed at commissioning.

EN 61558-2-6 Safety Isolation

The transformer provides full galvanic isolation between the multi-voltage primary and the 24V SELV secondary, certified to EN 61558-2-6 safety isolating transformer standards. The 24V output meets SELV requirements for direct connection to operator-accessible control devices — pushbuttons, limit switches, indicator lamps — without additional protective measures. The 490VA S6 short-time rating ensures multiple contactors pull in simultaneously during machine startup without voltage sag.