The Siemens SITAS 4AM3842-8JD40-0FA1 is a 160VA control transformer with a three-tap primary (400/385/245V AC) and dual 115V secondary windings rated at 0.7A each. As the 160VA variant in the 8JD40 tap configuration, it delivers 60% more continuous power than the 4AM3442-8JD40 (100VA) while maintaining the same three-tap primary flexibility — making it suitable for control panels with heavier contactor and solenoid loads that exceed the 100VA class but still require multi-voltage input capability.

Three-Tap Primary for Multi-Region Panels

The three discrete primary taps — 400V, 385V, and 245V — allow the transformer to be configured for different supply voltages by selecting the appropriate tap terminal at installation. This supports panel builders who standardize on one transformer model across product lines serving different regional voltage standards, reducing the number of transformer variants held in production inventory. The taps are clearly labeled on the terminal block for unambiguous field connection during panel commissioning.

160VA Continuous with 490VA Surge Rating

At 160VA continuous, the 8JD40-0FA1 supports larger control circuit loads than the 100VA-class SITAS transformers — more contactor coils, additional relay logic, or higher-power solenoid valves. The dual 115V secondary windings provide wiring flexibility: series connection yields 230V at 0.7A, parallel connection yields 115V at 1.4A. The 490VA S6 short-time rating (3.1× continuous) handles inrush from all connected inductive loads during panel power-up.