The Siemens SITAS 4AM4842-4TV00 is a 500 VA safety isolating transformer with a 42 V AC SELV secondary — the traditional safety control voltage for European industrial panels where cable runs are longer and voltage drop must be minimized. At 42 V, it delivers 11.9 A continuous — sufficient for large banks of safety relays and contactors distributed across a machine or production line. The 230 V primary with ±5% taps (218/230/242 V) connects directly to standard single-phase mains. With a 2,000 VA short-time (S6) rating — 4× the continuous rating — it handles simultaneous contactor pull-in without voltage dip. The EI 120/50 core in a 122 × 121 × 134 mm footprint at 7.36 kg marks the transition to the larger-frame SITAS construction for industrial-scale control power.

Key Features

• 42 V AC SELV output at 11.9 A — standard safety voltage for extended cable runs
• 2,000 VA short-time (S6) — 4× continuous rating for massive inrush handling
• 230 V ±5% primary taps (218/230/242 V) — simple single-phase mains connection
• 91% efficiency — a significant jump from the 250 VA class
• EN 61558-2-6 safety isolating transformer certification
• IP00, 122 × 121 × 134 mm, 7.36 kg, screws or DIN rail
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Large industrial safety circuits with extended wiring: automated production line emergency stop systems, conveyor safety interlock networks spanning tens of meters, and crane/hoist safety limit switch circuits. The 42 V output provides better voltage regulation over long cable runs compared to 24 V, maintaining reliable safety relay pull-in voltage at the far end of the circuit. Also used in process industry panels where legacy 42 V safety standards are still in effect.