Schneider Electric S30021-939-50 Control Transformer

Schneider Electric's Square D S30021-939-50 is a 0.025 kVA (25 VA) control transformer with dual primary inputs of 240 VAC or 480 VAC and a 24 VAC secondary, designed to supply reliable low-voltage control power for industrial equipment across 50/60 Hz systems, making it a versatile choice for panels that can be wired to either line voltage. With a 24 VAC secondary, it feeds the control circuits of relays, contactors, solenoids, and other control components, enabling safe, isolated control power from standard mains and facilitating quick integration into Square D or broader Schneider Electric installations thanks to its recognized catalog number and compatibility with typical control-power configurations. The S30021-939-50 designation identifies this specific transformer in the Square D/Schneider Electric family, aligning with standard industrial control practices and providing a compact, readily sourced solution for applications requiring a 24 VAC control supply derived from 240 or 480 VAC mains while operating at 50/60 Hz.