The Siemens 3NJ6930-3BF11 is a pluggable bushing current transformer for the SENTRON 3NJ6 series of in-line switch disconnectors with fuses. It provides a 200/1 A transformation ratio — the highest primary current rating in the 3NJ6930 plug-in range — with Class 1 accuracy and a 2.5 VA burden, making it a cost-effective choice for general-purpose current monitoring where billing-grade accuracy is not required.

200 A Primary for Higher-Capacity Feeders

With a 200 A primary rating, this transformer serves the higher end of NH1 fuse-protected circuits. The 21 mm cable opening accommodates larger conductors typically found in 200 A feeder applications, while the compact 44 x 65 x 30 mm footprint keeps panel space requirements modest.

1 A Secondary with 2.5 VA Burden

The 1 A secondary output reduces resistive losses in the measurement loop — particularly valuable when the CT and meter are separated by longer cable runs. The 2.5 VA burden rating supports connection to a single instrument or multiple series-connected devices with adequate lead length.

Decision Parameters