The Siemens SITAS 4AM3842-8JN00 is a 160 VA safety isolating transformer — the mid-range model bridging the 100 VA and 250 VA classes. It shares the same six-tap universal primary (415-215 V) and 24 V SELV output architecture as the 4AM3442 and 4AM4042 safety variants, delivering 60% more secondary current (6.67 A vs. 4.17 A) than the 100 VA model. The larger EI 96/44 core and 490 VA short-time capacity handle bigger safety relay banks, multiple contactor coils, and more extensive distributed safety I/O. At 98 × 106 × 104 mm and approximately 3.0 kg, it remains panel-mountable on DIN rail or screws.

Key Features

• Six primary taps (215–415 V) — one part for any global mains voltage
• 24 V AC SELV at 6.67 A — 60% more current than the 100 VA model
• 490 VA short-time (S6) for large contactor and relay inrush
• EN 61558-2-6 safety isolating transformer certification
• 86% efficiency, 50/60 Hz, IP00, EI 96/44 core
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Mid-to-large machine safety systems: comprehensive safety relay logic with multiple emergency stop zones, safety gate monitoring across several access points, light curtain arrays with muting functions, and press safety valve control circuits. The 160 VA capacity supports 6–8 safety relays or contactors simultaneously. The universal primary taps simplify global machine export — same transformer works everywhere.