The Siemens SITAS 4AM3442-8JN00 is a 100 VA safety isolating transformer that combines universal mains compatibility with SELV-compliant 24 V output — the entry point to the SITAS safety transformer range. Its six primary taps (415/400/385 V on the high range, 245/230/215 V on the low range) cover virtually any worldwide industrial single-phase supply from 215 V to 415 V with ±15 V adjustment per range. The fixed 24 V AC secondary at 4.17 A is EN 61558-2-6 certified for safety circuits and human-accessible control interfaces. With 310 VA short-time capacity, it handles contactor and relay inrush without voltage collapse. The EI 84/42 core in an 86 × 98 × 102 mm footprint represents the transition from miniature to industrial-scale SITAS construction.

Key Features

• Six primary taps covering 215–415 V — universal mains compatibility in one part
• 24 V AC SELV output at 4.17 A — safety-certified per EN 61558-2-6
• 310 VA short-time (S6) rating for inrush handling
• 86% efficiency, 50/60 Hz, IP00 open-frame
• Screw/tab terminals, screws or DIN rail mounting
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Safety control circuits in mid-sized machines: emergency stop relays, safety gate interlocks, light curtains, two-hand control monitors, and distributed safety I/O blocks. The 24 V SELV output at 100 VA powers a complete safety circuit with multiple safety relays. Also used as a dedicated safety supply for larger control panels where the safety circuit must be electrically separated from the general 230 V control supply.