The 3NJ6920-3DD00 is a CT busbar assembly for mounting four bushing current transformers onto a SENTRON 3NJ6 (NH00) in-line switch disconnector with fuses. With four CT positions on standard bushings, it supports three-phase plus neutral or ground-fault monitoring from a single plug-in unit.

Modular CT Mounting

The four-position design enables comprehensive monitoring — three phases plus an additional CT for neutral current, earth leakage, or a separate protection relay. Each position accepts a standard bushing-type current transformer. The assembly snaps into the 3NJ6 disconnector and can be retrofitted at any time.

Key Parameters

Retrofittable Design

All 3NJ6920 series busbar assemblies can be retrofitted at any time — no need to disconnect the main circuit or remove the switch disconnector from the panel. The plug-in interface ensures quick installation without tools, letting panel builders add metering capability as requirements evolve.