The Siemens SITAS 4AM4042-8JN00 is the highest-power safety isolating transformer with the universal six-tap primary — combining the full 250 VA / 850 VA S6 output of the 4AM4042 platform with SELV-compliant 24 V secondary at 10.4 A. Compared to the 4AM3842-8JN00 (160 VA), it delivers 56% more continuous current and 73% more short-time capacity in a chassis only 14 mm deeper. The six primary taps (415 V to 215 V) make it a single part number solution for safety circuits in machines shipped worldwide, while the EN 61558-2-6 certification satisfies machine safety directive requirements. The EI 96/58 core — the largest in the EI 96 family — provides the magnetic capacity for the highest 24 V output in the SITAS safety transformer range.

Key Features

• 250 VA continuous, 850 VA S6 — maximum 24 V safety power in SITAS range
• 10.4 A at 24 V SELV — powers the largest safety relay and contactor installations
• Six universal primary taps (215–415 V) — global machine export ready
• EN 61558-2-6 certified for safety isolating transformer applications
• 89% efficiency — highest in the 8JN00 safety series
• IP00, 98 × 106 × 118 mm, screws or DIN rail, UL/CSA recognized

Technical Data

Applications

Large machine safety systems: comprehensive press safety controls with multiple light curtains, safety mats, and emergency stop zones; robotic cell safety interlocks; automated assembly line safety circuits; and process industry emergency shutdown systems. The 10.4 A at 24 V SELV powers extensive distributed safety I/O networks, safety PLC modules, and large contactor banks from a single transformer. The universal primary taps eliminate country-specific transformer variants for global machine builders.