Square D KL300D5 Industrial Control Transformer

Square D 9070KL300D5 is a single‑phase, 300 VA industrial control transformer from the KL family. It features a 550 V primary and a 115 V secondary, providing dedicated control power from higher‑voltage mains to low‑voltage control circuits in industrial equipment, with an 80°C rise rating for reliable operation in typical panel environments. As part of Schneider Electric’s KL‑series control transformers, the 9070KL300D5 designation identifies a rugged, standard‑phase unit designed for use in control panels, motor starters, relays, and other automation devices. Versions listed with leads, such as the 610 mm (24 in) variant, offer convenient wiring inside cabinets without additional terminal blocks. In practice, this transformer supports control circuits for devices like contactors and overload relays, delivering the necessary current for multiple low‑power control loads while remaining compatible with common industrial electrical architectures. When replacing an older KL transformer, verify that your equipment’s input/output voltages match 550 V to 115 V and confirm the 1‑phase configuration and 300 VA rating to ensure proper performance and protection for your control system.