The Siemens SITAS 4AM4042-8EN00 is the safety isolating variant of the 4AM4042 series, certified to EN 61558-2-6 for SELV (Safety Extra-Low Voltage) applications. Where the -8ED40 delivers 2×115 V for general control circuits, the -8EN00 provides a fixed 24 V AC output at 10.4 A — the standard safety voltage for human-accessible control interfaces, pushbutton stations, limit switches, and sensor circuits. Twelve primary taps (600 V to 230 V) ensure compatibility with virtually any industrial mains voltage worldwide. The II0 vector group with no shielding winding provides galvanic isolation between primary and secondary for operator protection.

Key Features

• EN 61558-2-6 safety isolating transformer — certified for SELV circuits
• 24 V AC secondary at 10.4 A — powers safety interfaces and control devices
• 12 primary taps from 600 V to 230 V — universal mains compatibility
• 850 VA short-time (S6) rating handles inrush from contactors and relays
• Galvanic isolation between primary and secondary (II0 vector group)
• 89% efficient, 50/60 Hz, IP00 open-frame, 98 × 106 × 118 mm
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Safety-critical control panels: emergency stop circuits, two-hand control stations, light curtain interfaces, door interlock systems, and operator pushbutton panels. The 24 V SELV output meets machine safety directive requirements for human-accessible control voltages. Also used in building automation for touch-safe HVAC control interfaces and access control systems.