Siemens WMS8U Meter Stack Module Lever Bypass Fusible Switch

Siemens WMS8U Meter Stack Module Lever Bypass Fusible Switch is a purpose-built, 800 A per-position fusible switch assembly designed for Siemens meter stacks in commercial and multi-tenant installations. The lever-bypass feature enables safe meter removal or replacement without interrupting power to the downstream bus, while the fuse element provides short-circuit protection in a single-phase configuration. This WMS8U unit supports 1-phase service (max 120/240 V AC) and accommodates three-phase-in, single-phase-out configurations at 208Y/120 V AC or three-phase 240 V AC, enabling flexible utility layouts in office, retail, or high-rise buildings. It is UL-listed to UL 67 (UL file E27100) with an AIC rating of 65 kAIC, reflecting robust protection for typical commercial metering applications. In Siemens’ Power Mod/Commercial Metering family, WMS modules are designed to mate with modular meter stacks and provide a reliable, scalable approach to submetering with integration into indoor (NEMA 1) or outdoor (NEMA 3R) environments per enclosure requirements. With an 800 A per-position rating and the built-in lever bypass, the WMS8U supports efficient maintenance workflows and orderly tenant-meter deployment within a single, compact stack, reducing installation complexity in multi-unit buildings. Refer to Siemens’ selection guides for exact compatibility, jaw configurations, and position counts within the WMS family.