The Siemens 3NJ6920-3BD23 is a pluggable bushing current transformer designed as a direct-fit accessory for 3NJ6 in-line switch disconnectors with fuses. It combines Class 0.5 accuracy with legal-for-trade calibration and a 5 A secondary output — the standard interface for billing meters and energy management systems.

Application

Rated 100/5 A, this calibrated CT supports revenue-grade energy measurement in low-voltage distribution. The 5 A secondary is directly compatible with standard utility meters, sub-billing devices, and building energy management systems. The 14 mm bushing opening targets branch circuits with compact conductor cross-sections. Typical deployments include tenant submetering, cost allocation, and energy monitoring in commercial and industrial facilities.

Installation

The pluggable design enables tool-free installation directly onto compatible 3NJ6 in-line switch disconnectors. The 14 mm bushing opening routes the primary conductor through the transformer core. The CT snaps into the dedicated accessory port on the switch disconnector body — no additional wiring or mounting hardware is needed.

Decision Parameters