The Siemens 3NJ6920-3BD13 is a pluggable bushing current transformer designed as a direct-fit accessory for 3NJ6 in-line switch disconnectors with fuses. Its legal-for-trade calibration makes it suitable for billing-grade energy measurement applications where verified accuracy is mandatory.

Application

This 100/1 A current transformer serves low-voltage power distribution systems requiring secondary current measurement, monitoring, or billing metering. The 1 A secondary output supports long-distance signal transmission to metering devices with minimal line losses. Typical use cases include utility sub-metering, tenant billing, energy management systems, and building automation with revenue-grade measurement points.

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. No additional wiring or mounting hardware is needed — the CT snaps into the dedicated accessory port on the switch disconnector body.

Decision Parameters