Swallow Electric SUL-HB-4000E-0230 Control Transformer

Swallow Electric SUL-HB-4000E-0230 is a single-phase control transformer rated at 4.0 kVA, manufactured by Swallow Electric Co., Ltd. The model sits in the SUL-HB family and is identified by the 4000E-0230 suffix, indicating its place in Swallow’s line of medium-capacity control transformers used in electrical control panels and automated equipment. As a control transformer, it provides an isolated source of voltage to power relay coils, contactors, PLC input modules, and other low-voltage control devices, helping separate control circuits from heavier power circuits within a cabinet. The 4.0 kVA rating conveys its capacity to support multiple control loads concurrently, enabling panel builders to consolidate relays, timers, and signaling components in a compact footprint. This model is selected when a robust, single-phase transformer is required for mid-sized control applications, such as machine controls and industrial automation assemblies, where dependable voltage delivery for low-voltage controls is essential.