The Siemens 3NJ6930-3BE23 is a pluggable bushing current transformer designed as an accessory for the SENTRON 3NJ6 series of in-line switch disconnectors with fuses, size NH1. It converts a primary current of 150 A to a 5 A secondary signal with Class 0.5 accuracy, carrying legal-for-trade calibration for billing-grade energy measurement in low-voltage distribution systems up to 720 V.

5 A Secondary for Standard Meter Interface

The 5 A secondary output is the industry-standard interface for direct connection to energy meters, panel instruments, and protection relays. This makes the 3BE23 the straightforward choice when the CT is located near the measurement device and standard wiring is used — no special scaling or interface adaptation required.

Contact Protection for Personnel Safety

With a 48 mm deep enclosure and integrated touch protection, this variant meets elevated safety requirements for installations where accidental contact is a concern. The 15.2 mm inside diameter accommodates cables up to 14 mm, while the plug-in design allows fast retrofit onto existing 3NJ6 switch disconnectors without interrupting the main circuit.

Decision Parameters