Trapped-key sequences (Transformer–DG–Bus coupler)
Castell / Key Transfer Interlock System — part of our interlocking & changeover systems range, sourced from leading manufacturers for panel-building and distribution across the UAE. Available in: Trapped-key sequences (Transformer–DG–Bus coupler). Mechanically or electrically interlocks two breakers for safe changeover between sources, such as mains-generator transfer. Built to IEC 61439-1/2 and IEC 60947-2, for main LV switchboards and panel-builder assemblies across the UAE.
