The Siemens SITAS 4AM3842-5AT10 is a 160 VA control transformer — the dedicated step-down variant in the 4AM3842 series for straightforward 400 V to 230 V control voltage conversion. Unlike the multi-tap 8JN00 safety models, the 5AT10 provides a simple three-tap primary (380/400/420 V) for installations where the mains voltage is known and fixed. The 490 VA short-time (S6) rating — over 3× the continuous rating — handles the inrush demands of contactor coils and relay banks without voltage sag. The EI 96/44 core design, shared with the 4AM3842 safety variants, provides a solid foundation for continuous industrial duty in a 98 × 106 × 104 mm panel-mountable package at approximately 3.0 kg.

Key Features

• 400 V ±5% to 230 V step-down — simple, reliable control voltage conversion
• 490 VA short-time (S6) — over 3× continuous rating for inrush loads
• Three primary taps (380/400/420 V) — precise site voltage matching
• 86% efficiency, 50/60 Hz operation
• IP00 open-frame — 98 × 106 × 104 mm, screws or DIN rail mounting
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Standard industrial control panels: powering contactor coils (AC-1 duty), relay logic banks, solenoid valve power supplies, and general 230 V control circuit distribution. The 160 VA rating is sized for medium-complexity machines with 5–8 contactors or relay circuits. Suitable for OEM machine panels where the supply voltage is consistently 400 V three-phase and a simple step-down to 230 V single-phase control is all that is needed.