The Siemens SITAS 4AM3842-4TV00 is a 160VA safety isolating transformer delivering 42V AC SELV from a 230V AC mains supply, designed for powering handheld electric tools, portable work lights, and machine-mounted illumination in industrial workshops and assembly lines. The 42V secondary is widely adopted in European manufacturing as a safe voltage level — high enough to drive induction motors in portable tools efficiently, low enough to eliminate electric shock hazard under SELV conditions per EN 61558-2-6.

42V SELV for Operator-Safe Tool Power

At 3.81A continuous, the transformer powers multiple 42V work lights, handheld grinders, drills, and soldering irons simultaneously. The 42V standard is common in German and European automotive assembly plants, where tools and task lighting must operate at safe touch voltages without the bulk and weight of battery packs. The primary ±5% taps (218/230/242V) ensure stable 42V output despite mains fluctuations.

490VA Short-Time Rating for Motor Inrush

Handheld power tools draw several times their running current during motor startup. The 490VA S6 short-time rating provides the momentary power needed for tool motors to reach operating speed without tripping protection or causing voltage sag that would dim work lights on the same circuit.