Yaskawa Electric Corporation USN-B Control Power Transformer

The Yaskawa Electric Corporation USN-B 50VA is a panel-mounted control power transformer that provides a stable, low-voltage source for industrial control circuits in automation systems. It steps down and isolates power for relays, logic circuits, and control electronics in servo drive systems and PLC-based installations, with multi-tap input/output configurations that vary by variant and an operating frequency of 50/60 Hz. Built for rugged industrial environments, this Japan-made transformer features passive cooling and an industrial enclosed construction; it is designed to support consistent voltage conversion and isolation in control panels and automation modules. This legacy/surplus-market available unit is commonly used as a replacement for failed transformers to restore control power reliability, with common replacements including the Yaskawa USN-B 75VA, 100VA, and generic 50VA industrial control transformers.