The Siemens 3NJ6920-3BE22 is a pluggable bushing current transformer designed as a direct-fit accessory for 3NJ6 in-line switch disconnectors with fuses. With a 150/5 A ratio, Class 0.5 accuracy, and 1.5 VA burden, it offers precision current measurement in a compact plug-in form factor.

Application

This CT is suited for low-voltage distribution applications on 150 A circuits requiring above-standard measurement accuracy — such as energy audits, power quality trending, and load profiling — without the regulatory requirements of legal-for-trade calibration. The 5 A secondary output connects directly to standard panel meters, PLC analog inputs, and data loggers. Typical deployments include industrial power distribution monitoring, machine-level energy tracking, and building automation systems.

Installation

The pluggable design enables tool-free installation directly onto compatible 3NJ6 in-line switch disconnectors. The 21 mm bushing opening accommodates larger conductor cross-sections. The CT snaps into the dedicated accessory port on the switch disconnector body — no additional wiring or mounting hardware is needed.

Decision Parameters