The SITAS 4AM3242-5AN00-0EA0 is a 63VA single-phase control transformer that converts a 400VAC mains supply to a safety-isolated 24VAC secondary — the standard control voltage for contactor coils, relays, PLC power inputs, and indicator lamps in industrial automation panels. Its 190VA short-time rating (S6 duty) provides the surge headroom to energize multiple contactors simultaneously without voltage sag, while continuous 63VA handles the steady-state holding current of the control circuit.

Voltage Configuration

The primary winding features a ±5% tap arrangement — 380V, 400V, and 420V terminals — allowing the installer to match the transformer to the actual measured mains voltage at the panel location. This three-tap design compensates for site-to-site voltage variation without ordering a different part number. The secondary delivers a fixed 24V at up to 2.63A. Frequency compatibility spans 50/60Hz, so the same unit works on European 50Hz and North American 60Hz grids.

Safety and Compliance

Designed as a safety isolating transformer per EN 61558-2-6, the 4AM3242 provides galvanic separation between the mains primary and the control circuit secondary — a fundamental safety requirement in industrial control panels where operators interact with pushbuttons, selector switches, and indicator lights on the cabinet door. The II0 vector group means the secondary is electrically isolated from the primary with no earth reference unless intentionally grounded. Recognized under UL/CSA and carrying CE and cRUus marks, the transformer is accepted in panels destined for both European and North American markets.

Installation

The EI 84/28 laminated iron core measures 86mm wide, 98mm tall, and 90mm deep. Mounting is via screws to the panel backplate or via a standard DIN rail adapter. Screw terminals and flat-blade tab terminals accommodate standard panel wiring practices. IP00 protection requires installation inside the control cabinet enclosure. Thermal class B (IEC 60085) allows a maximum ambient temperature of 40°C at full load. Approximate net weight is 1.7kg.

Key Decision Parameters

For the same 400V→24V configuration, the 4AM3242-5AN00-0EA0 is the standard choice. For multi-tap primary variants with broader input voltage flexibility, see the 8-prefix models in the same SITAS 4AM series.