Siemens 8UC9400 Interlocking Kit

Siemens 8UC9400 Interlocking Kit with Manual is a UL 508A–compliant interlocking module (MLFB 8UC9400) for Siemens low‑voltage disconnectors, designed to provide a mechanical interlock between adjacent devices to support safe, code‑compliant operation in Siemens switchgear. The kit is marketed by Siemens Industry Mall as an interlocking accessory and is referenced by distributors for use with Siemens LV disconnect assemblies. The accompanying installation manual covers mounting and alignment, and Siemens literature notes drive shaft and coupling considerations to coordinate the interlock with door‑operating mechanisms; in certain configurations it can be used with Siemens door‑coupling rotary mechanisms such as 3VL series components. This interlocking kit is typically employed in panels and switchgear setups where preventing independent operation of two disconnect points is required.